diff --git a/bon-macros/src/builder/builder_gen/builder_decl.rs b/bon-macros/src/builder/builder_gen/builder_decl.rs
index 10b6acdd..c4758549 100644
--- a/bon-macros/src/builder/builder_gen/builder_decl.rs
+++ b/bon-macros/src/builder/builder_gen/builder_decl.rs
@@ -9,10 +9,6 @@ impl super::BuilderGenCtx {
         let where_clause = &self.generics.where_clause;
         let phantom_data = self.phantom_data();
         let state_mod = &self.state_mod.ident;
-        let phantom_field = &self.ident_pool.phantom;
-        let receiver_field = &self.ident_pool.receiver;
-        let start_fn_args_field = &self.ident_pool.start_fn_args;
-        let named_members_field = &self.ident_pool.named_members;
 
         // The fields can't be hidden using Rust's privacy syntax.
         // The details about this are described in the blog post:
@@ -27,7 +23,8 @@ impl super::BuilderGenCtx {
             // generated code. This simplifies the task of removing unnecessary
             // attributes from the generated code when preparing for demo purposes.
             let deprecated_msg = "\
-                this field should not be used directly; it's an implementation detail \
+                this field should not be used directly; it's an implementation detail, and \
+                if you access it directly, you may break some internal unsafe invariants; \
                 if you found yourself needing it, then you are probably doing something wrong; \
                 feel free to open an issue/discussion in our GitHub repository \
                 (https://github.com/elastio/bon) or ask for help in our Discord server \
@@ -43,7 +40,7 @@ impl super::BuilderGenCtx {
             let ty = &receiver.without_self_keyword;
             quote! {
                 #private_field_attrs
-                #receiver_field: #ty,
+                __unsafe_private_receiver: #ty,
             }
         });
 
@@ -62,7 +59,7 @@ impl super::BuilderGenCtx {
         let start_fn_args_field = start_fn_arg_types.peek().is_some().then(|| {
             quote! {
                 #private_field_attrs
-                #start_fn_args_field: (#(#start_fn_arg_types,)*),
+                __unsafe_private_start_fn_args: (#(#start_fn_arg_types,)*),
             }
         });
 
@@ -104,7 +101,7 @@ impl super::BuilderGenCtx {
             #where_clause
             {
                 #private_field_attrs
-                #phantom_field: #phantom_data,
+                __unsafe_private_phantom: #phantom_data,
 
                 #receiver_field
                 #start_fn_args_field
@@ -112,7 +109,7 @@ impl super::BuilderGenCtx {
                 #( #custom_fields_idents: #custom_fields_types, )*
 
                 #private_field_attrs
-                #named_members_field: (
+                __unsafe_private_named: (
                     #(
                         ::core::option::Option<#named_members_types>,
                     )*
diff --git a/bon-macros/src/builder/builder_gen/builder_derives.rs b/bon-macros/src/builder/builder_gen/builder_derives.rs
index b49d8d37..240cdec7 100644
--- a/bon-macros/src/builder/builder_gen/builder_derives.rs
+++ b/bon-macros/src/builder/builder_gen/builder_derives.rs
@@ -70,17 +70,12 @@ impl BuilderGenCtx {
         let generic_args = &self.generics.args;
         let builder_ident = &self.builder_type.ident;
 
-        let phantom_field = &self.ident_pool.phantom;
-        let receiver_field = &self.ident_pool.receiver;
-        let start_fn_args_field = &self.ident_pool.start_fn_args;
-        let named_members_field = &self.ident_pool.named_members;
-
         let clone = quote!(::core::clone::Clone);
 
         let clone_receiver = self.receiver().map(|receiver| {
             let ty = &receiver.without_self_keyword;
             quote! {
-                #receiver_field: <#ty as #clone>::clone(&self.#receiver_field),
+                __unsafe_private_receiver: <#ty as #clone>::clone(&self.__unsafe_private_receiver),
             }
         });
 
@@ -96,8 +91,8 @@ impl BuilderGenCtx {
                 // ```
                 // required for `(...big type...)` to implement `Clone`
                 // ```
-                #start_fn_args_field: (
-                    #( <#types as #clone>::clone(&self.#start_fn_args_field.#indices), )*
+                __unsafe_private_start_fn_args: (
+                    #( <#types as #clone>::clone(&self.__unsafe_private_start_fn_args.#indices), )*
                 ),
             }
         });
@@ -115,7 +110,7 @@ impl BuilderGenCtx {
 
             quote! {
                 #bon::__::derives::clone_member::<#ty>(
-                    &self.#named_members_field.#member_index
+                    &self.__unsafe_private_named.#member_index
                 )
             }
         });
@@ -148,7 +143,7 @@ impl BuilderGenCtx {
             {
                 fn clone(&self) -> Self {
                     Self {
-                        #phantom_field: ::core::marker::PhantomData,
+                        __unsafe_private_phantom: ::core::marker::PhantomData,
                         #clone_receiver
                         #clone_start_fn_args
                         #( #clone_fields, )*
@@ -160,7 +155,7 @@ impl BuilderGenCtx {
                         // ```
                         // required for `(...big type...)` to implement `Clone`
                         // ```
-                        #named_members_field: ( #( #clone_named_members, )* ),
+                        __unsafe_private_named: ( #( #clone_named_members, )* ),
                     }
                 }
             }
@@ -168,9 +163,6 @@ impl BuilderGenCtx {
     }
 
     fn derive_debug(&self, derive: &DeriveConfig) -> TokenStream {
-        let receiver_field = &self.ident_pool.receiver;
-        let start_fn_args_field = &self.ident_pool.start_fn_args;
-        let named_members_field = &self.ident_pool.named_members;
         let bon = &self.bon;
 
         let format_members = self.members.iter().filter_map(|member| {
@@ -183,7 +175,7 @@ impl BuilderGenCtx {
                         output.field(
                             #member_ident_str,
                             #bon::__::derives::as_dyn_debug::<#member_ty>(
-                                &self.#start_fn_args_field.#member_index
+                                &self.__unsafe_private_start_fn_args.#member_index
                             )
                         );
                     })
@@ -206,7 +198,7 @@ impl BuilderGenCtx {
                     let member_ident_str = &member.name.snake_raw_str;
                     let member_ty = member.underlying_norm_ty();
                     Some(quote! {
-                        if let Some(value) = &self.#named_members_field.#member_index {
+                        if let Some(value) = &self.__unsafe_private_named.#member_index {
                             output.field(
                                 #member_ident_str,
                                 #bon::__::derives::as_dyn_debug::<#member_ty>(value)
@@ -228,7 +220,7 @@ impl BuilderGenCtx {
                 output.field(
                     "self",
                     #bon::__::derives::as_dyn_debug::<#ty>(
-                        &self.#receiver_field
+                        &self.__unsafe_private_receiver
                     )
                 );
             }
diff --git a/bon-macros/src/builder/builder_gen/finish_fn.rs b/bon-macros/src/builder/builder_gen/finish_fn.rs
index 338685e2..a445139f 100644
--- a/bon-macros/src/builder/builder_gen/finish_fn.rs
+++ b/bon-macros/src/builder/builder_gen/finish_fn.rs
@@ -2,7 +2,7 @@ use super::member::{Member, PosFnMember};
 use crate::util::prelude::*;
 
 impl super::BuilderGenCtx {
-    fn finish_fn_member_expr(&self, member: &Member) -> TokenStream {
+    fn finish_fn_member_expr(member: &Member) -> TokenStream {
         let member = match member {
             Member::Named(member) => member,
             Member::Skip(member) => {
@@ -14,9 +14,8 @@ impl super::BuilderGenCtx {
             }
             Member::StartFn(member) => {
                 let index = &member.index;
-                let start_fn_args_field = &self.ident_pool.start_fn_args;
 
-                return quote! { self.#start_fn_args_field.#index };
+                return quote! { self.__unsafe_private_start_fn_args.#index };
             }
             Member::FinishFn(member) => {
                 return member
@@ -31,9 +30,8 @@ impl super::BuilderGenCtx {
 
         let index = &member.index;
 
-        let named_members_field = &self.ident_pool.named_members;
         let member_field = quote! {
-            self.#named_members_field.#index
+            self.__unsafe_private_named.#index
         };
 
         let default = member
@@ -88,7 +86,7 @@ impl super::BuilderGenCtx {
 
     pub(super) fn finish_fn(&self) -> TokenStream {
         let members_vars_decls = self.members.iter().map(|member| {
-            let expr = self.finish_fn_member_expr(member);
+            let expr = Self::finish_fn_member_expr(member);
             let var_ident = member.orig_ident();
 
             // The type hint is necessary in some cases to assist the compiler
diff --git a/bon-macros/src/builder/builder_gen/input_fn.rs b/bon-macros/src/builder/builder_gen/input_fn.rs
index 62d1cf68..10e28708 100644
--- a/bon-macros/src/builder/builder_gen/input_fn.rs
+++ b/bon-macros/src/builder/builder_gen/input_fn.rs
@@ -454,10 +454,7 @@ impl FinishFnBody for FnCallBody {
         let prefix = self
             .sig
             .receiver()
-            .map(|_| {
-                let receiver_field = &ctx.ident_pool.receiver;
-                quote!(self.#receiver_field.)
-            })
+            .map(|_| quote!(self.__unsafe_private_receiver.))
             .or_else(|| {
                 let self_ty = &self.impl_ctx.as_deref()?.self_ty;
                 Some(quote!(<#self_ty>::))
diff --git a/bon-macros/src/builder/builder_gen/models.rs b/bon-macros/src/builder/builder_gen/models.rs
index c0d5c667..4083930c 100644
--- a/bon-macros/src/builder/builder_gen/models.rs
+++ b/bon-macros/src/builder/builder_gen/models.rs
@@ -135,10 +135,6 @@ pub(crate) struct BuilderGenCtx {
     /// Path to the `bon` crate.
     pub(super) bon: syn::Path,
 
-    /// Private identifiers that are used in the builder implementation.
-    /// They are intentionally randomized to prevent users from accessing them.
-    pub(super) ident_pool: PrivateIdentsPool,
-
     /// Name of the generic variable that holds the builder's state.
     pub(super) state_var: syn::Ident,
 
@@ -160,22 +156,6 @@ pub(crate) struct BuilderGenCtx {
     pub(super) finish_fn: FinishFn,
 }
 
-/// Identifiers that are private to the builder implementation. The users should
-/// not use them directly. They are randomly generated to prevent users from
-/// using them. Even if they try to reference them, they won't be able to re-compile
-/// their code because the names of these identifiers are regenerated on every
-/// macro run.
-///
-/// This is an unfortunate workaround due to the limitations of defining the
-/// builder type inside of a nested module. See more details on this problem in
-/// <https://bon-rs.com/blog/the-weird-of-function-local-types-in-rust>
-pub(super) struct PrivateIdentsPool {
-    pub(super) phantom: syn::Ident,
-    pub(super) receiver: syn::Ident,
-    pub(super) start_fn_args: syn::Ident,
-    pub(super) named_members: syn::Ident,
-}
-
 pub(super) struct BuilderGenCtxParams<'a> {
     pub(crate) bon: Option<syn::Path>,
     pub(super) namespace: Cow<'a, GenericsNamespace>,
@@ -333,7 +313,6 @@ impl BuilderGenCtx {
         Ok(Self {
             bon: bon.unwrap_or_else(|| syn::parse_quote!(::bon)),
             state_var,
-            ident_pool: PrivateIdentsPool::new(),
             members,
             allow_attrs,
             on,
@@ -347,69 +326,6 @@ impl BuilderGenCtx {
     }
 }
 
-impl PrivateIdentsPool {
-    fn new() -> Self {
-        use std::collections::hash_map::RandomState;
-        use std::hash::{BuildHasher, Hasher};
-
-        // Thanks @orhun for the article https://blog.orhun.dev/zero-deps-random-in-rust/
-        let random = RandomState::new().build_hasher().finish();
-
-        // Totally random words. All coincidences are purely accidental 😸
-        let random_words = [
-            "amethyst",
-            "applejack",
-            "blackjack",
-            "bon",
-            "cadance",
-            "celestia",
-            "cheerilee",
-            "derpy",
-            "fleetfoot",
-            "flitter",
-            "fluttershy",
-            "izzy",
-            "lilly",
-            "littlepip",
-            "luna",
-            "lyra",
-            "maud",
-            "minuette",
-            "octavia",
-            "pinkie",
-            "pipp",
-            "rainbow",
-            "rampage",
-            "rarity",
-            "roseluck",
-            "scootaloo",
-            "seaswirl",
-            "spitfire",
-            "starlight",
-            "sunset",
-            "sweetie",
-            "trixie",
-            "twilight",
-            "twinkleshine",
-            "twist",
-            "velvet",
-            "vinyl",
-        ];
-
-        #[allow(clippy::cast_possible_truncation)]
-        let random_word = random_words[(random % (random_words.len() as u64)) as usize];
-
-        let ident = |name: &str| format_ident!("__private_{random_word}_{name}");
-
-        Self {
-            phantom: ident("phantom"),
-            receiver: ident("receiver"),
-            start_fn_args: ident("start_fn_args"),
-            named_members: ident("named_members"),
-        }
-    }
-}
-
 impl Generics {
     pub(super) fn new(
         decl_with_defaults: Vec<syn::GenericParam>,
diff --git a/bon-macros/src/builder/builder_gen/setters/mod.rs b/bon-macros/src/builder/builder_gen/setters/mod.rs
index cde0ec1d..993d2f45 100644
--- a/bon-macros/src/builder/builder_gen/setters/mod.rs
+++ b/bon-macros/src/builder/builder_gen/setters/mod.rs
@@ -342,12 +342,6 @@ impl<'a> SettersCtx<'a> {
         let body = match imp.body {
             SetterBody::Forward { body } => body,
             SetterBody::SetMember { expr } => {
-                let idents = &self.base.ident_pool;
-                let phantom_field = &idents.phantom;
-                let receiver_field = &idents.receiver;
-                let start_fn_args_field = &idents.start_fn_args;
-                let named_members_field = &idents.named_members;
-
                 let mut output = if !self.member.is_stateful() {
                     quote! {
                         self
@@ -355,26 +349,24 @@ impl<'a> SettersCtx<'a> {
                 } else {
                     let builder_ident = &self.base.builder_type.ident;
 
-                    let maybe_receiver_field = self
-                        .base
-                        .receiver()
-                        .map(|_| quote!(#receiver_field: self.#receiver_field,));
+                    let maybe_receiver_field = self.base.receiver().map(
+                        |_| quote!(__unsafe_private_receiver: self.__unsafe_private_receiver,),
+                    );
 
-                    let maybe_start_fn_args_field = self
-                        .base
-                        .start_fn_args()
-                        .next()
-                        .map(|_| quote!(#start_fn_args_field: self.#start_fn_args_field,));
+                    let maybe_start_fn_args_field =
+                        self.base.start_fn_args().next().map(
+                            |_| quote!(__unsafe_private_start_fn_args: self.__unsafe_private_start_fn_args,),
+                        );
 
                     let custom_fields_idents = self.base.custom_fields().map(|field| &field.ident);
 
                     quote! {
                         #builder_ident {
-                            #phantom_field: ::core::marker::PhantomData,
+                            __unsafe_private_phantom: ::core::marker::PhantomData,
                             #( #custom_fields_idents: self.#custom_fields_idents, )*
                             #maybe_receiver_field
                             #maybe_start_fn_args_field
-                            #named_members_field: self.#named_members_field,
+                            __unsafe_private_named: self.__unsafe_private_named,
                         }
                     }
                 };
@@ -393,7 +385,7 @@ impl<'a> SettersCtx<'a> {
 
                 let index = &self.member.index;
                 quote! {
-                    self.#named_members_field.#index = #expr;
+                    self.__unsafe_private_named.#index = #expr;
                     #output
                 }
             }
diff --git a/bon-macros/src/builder/builder_gen/start_fn.rs b/bon-macros/src/builder/builder_gen/start_fn.rs
index 829e71b0..728e4b74 100644
--- a/bon-macros/src/builder/builder_gen/start_fn.rs
+++ b/bon-macros/src/builder/builder_gen/start_fn.rs
@@ -21,17 +21,12 @@ impl super::BuilderGenCtx {
         let where_clause = &generics.where_clause;
         let generic_args = &self.generics.args;
 
-        let phantom_field = &self.ident_pool.phantom;
-        let receiver_field = &self.ident_pool.receiver;
-        let start_fn_args_field = &self.ident_pool.start_fn_args;
-        let named_members_field = &self.ident_pool.named_members;
-
         let receiver = self.receiver();
 
         let receiver_field_init = receiver.map(|receiver| {
             let self_token = &receiver.with_self_keyword.self_token;
             quote! {
-                #receiver_field: #self_token,
+                __unsafe_private_receiver: #self_token,
             }
         });
 
@@ -68,7 +63,7 @@ impl super::BuilderGenCtx {
         let start_fn_args_field_init = start_fn_args.peek().is_some().then(|| {
             let idents = start_fn_args.map(|member| &member.base.ident);
             quote! {
-                #start_fn_args_field: (#(#idents,)*),
+                __unsafe_private_start_fn_args: (#(#idents,)*),
             }
         });
 
@@ -129,11 +124,11 @@ impl super::BuilderGenCtx {
                 #( #custom_fields_vars )*
 
                 #builder_ident {
-                    #phantom_field: ::core::marker::PhantomData,
+                    __unsafe_private_phantom: ::core::marker::PhantomData,
                     #( #custom_fields_idents, )*
                     #receiver_field_init
                     #start_fn_args_field_init
-                    #named_members_field: #named_members_field_init,
+                    __unsafe_private_named: #named_members_field_init,
                 }
             }
         }
diff --git a/bon/tests/integration/ui/compile_fail/private_fields_access.rs b/bon/tests/integration/ui/compile_fail/private_fields_access.rs
new file mode 100644
index 00000000..5610ff92
--- /dev/null
+++ b/bon/tests/integration/ui/compile_fail/private_fields_access.rs
@@ -0,0 +1,24 @@
+#![deny(warnings)]
+
+struct Sut;
+
+#[bon::bon]
+impl Sut {
+    #[builder]
+    fn sut(self, #[builder(start_fn)] _x1: u32, _x2: u32) {}
+}
+
+fn main() {
+    let sut = Sut.sut(99);
+
+    // Previously, there was an attempt to generate names for private fields
+    // with randomness to ensure users don't try to access them. This however,
+    // conflicts with caching in some build systems. See the following issue
+    // for details: https://github.com/elastio/bon/issues/218
+    let SutSutBuilder {
+        __unsafe_private_phantom: _,
+        __unsafe_private_start_fn_args: _,
+        __unsafe_private_receiver: _,
+        __unsafe_private_named: _,
+    } = sut;
+}
diff --git a/bon/tests/integration/ui/compile_fail/private_fields_access.stderr b/bon/tests/integration/ui/compile_fail/private_fields_access.stderr
new file mode 100644
index 00000000..6d491d2a
--- /dev/null
+++ b/bon/tests/integration/ui/compile_fail/private_fields_access.stderr
@@ -0,0 +1,30 @@
+error: use of deprecated field `SutSutBuilder::__unsafe_private_phantom`: this field should not be used directly; it's an implementation detail, and if you access it directly, you may break some internal unsafe invariants; if you found yourself needing it, then you are probably doing something wrong; feel free to open an issue/discussion in our GitHub repository (https://github.com/elastio/bon) or ask for help in our Discord server (https://bon-rs.com/discord)
+  --> tests/integration/ui/compile_fail/private_fields_access.rs:19:9
+   |
+19 |         __unsafe_private_phantom: _,
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> tests/integration/ui/compile_fail/private_fields_access.rs:1:9
+   |
+1  | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(deprecated)]` implied by `#[deny(warnings)]`
+
+error: use of deprecated field `SutSutBuilder::__unsafe_private_start_fn_args`: this field should not be used directly; it's an implementation detail, and if you access it directly, you may break some internal unsafe invariants; if you found yourself needing it, then you are probably doing something wrong; feel free to open an issue/discussion in our GitHub repository (https://github.com/elastio/bon) or ask for help in our Discord server (https://bon-rs.com/discord)
+  --> tests/integration/ui/compile_fail/private_fields_access.rs:20:9
+   |
+20 |         __unsafe_private_start_fn_args: _,
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: use of deprecated field `SutSutBuilder::__unsafe_private_receiver`: this field should not be used directly; it's an implementation detail, and if you access it directly, you may break some internal unsafe invariants; if you found yourself needing it, then you are probably doing something wrong; feel free to open an issue/discussion in our GitHub repository (https://github.com/elastio/bon) or ask for help in our Discord server (https://bon-rs.com/discord)
+  --> tests/integration/ui/compile_fail/private_fields_access.rs:21:9
+   |
+21 |         __unsafe_private_receiver: _,
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: use of deprecated field `SutSutBuilder::__unsafe_private_named`: this field should not be used directly; it's an implementation detail, and if you access it directly, you may break some internal unsafe invariants; if you found yourself needing it, then you are probably doing something wrong; feel free to open an issue/discussion in our GitHub repository (https://github.com/elastio/bon) or ask for help in our Discord server (https://bon-rs.com/discord)
+  --> tests/integration/ui/compile_fail/private_fields_access.rs:22:9
+   |
+22 |         __unsafe_private_named: _,
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/website/src/guide/basics/optional-members.md b/website/src/guide/basics/optional-members.md
index d8ed96ff..3a18b7e9 100644
--- a/website/src/guide/basics/optional-members.md
+++ b/website/src/guide/basics/optional-members.md
@@ -109,6 +109,6 @@ let result = example()
 
 You can also reference other members in the default expression. See [`#[builder(default)]`](../../reference/builder/member/default#evaluation-context) reference for details.
 
-## Conditional building
+## Conditional Building
 
 Now that you know how optional members work you can check out the [Conditional Building](../patterns/conditional-building) design patterns or continue studying other features of `bon` by following the "Next page" link at the bottom.
diff --git a/website/src/reference/builder/top-level/state_mod.md b/website/src/reference/builder/top-level/state_mod.md
index dce393f1..2a6ea0d2 100644
--- a/website/src/reference/builder/top-level/state_mod.md
+++ b/website/src/reference/builder/top-level/state_mod.md
@@ -26,7 +26,7 @@ Overrides name, visibility and docs for the builder's [typestate API](../../../g
 
 ## `name`
 
-The default name for the builder typestate API module is a `snake_case` version from the name of the [`builder_type`](./builder_type#name).
+The default name for the builder typestate API module is a `snake_case` version of the name of the [`builder_type`](./builder_type#name).
 
 ## `vis`