Fixes evaluation of large positive bigint in the UPLC machine

  Fixes #511.

crates/uplc/src/machine/value.rs

@@ -316,10 +316,8 @@ pub fn from_pallas_bigint(n: &pallas::BigInt) -> BigInt {
 }
 
 pub fn to_pallas_bigint(n: &BigInt) -> pallas::BigInt {
-    if n.bits() <= 64 {
-        let regular_int: i64 = n.try_into().unwrap();
-        let pallas_int: pallas_codec::utils::Int = regular_int.into();
-
+    if let Ok(i) = <&BigInt as TryInto<i64>>::try_into(n) {
+        let pallas_int: pallas_codec::utils::Int = i.into();
         pallas::BigInt::Int(pallas_int)
     } else if n.is_positive() {
         let (_, bytes) = n.to_bytes_be();

examples/acceptance_tests/087/aiken.lock

@@ -0,0 +1,13 @@
+# This file was generated by Aiken
+# You typically do not need to edit this file
+
+[[requirements]]
+name = "aiken-lang/stdlib"
+version = "main"
+source = "github"
+
+[[packages]]
+name = "aiken-lang/stdlib"
+version = "main"
+requirements = []
+source = "github"

examples/acceptance_tests/087/aiken.toml

@@ -0,0 +1,8 @@
+name = "aiken-lang/acceptance_test_087"
+version = "0.0.0"
+description = ""
+
+[[dependencies]]
+name = 'aiken-lang/stdlib'
+version = 'main'
+source = 'github'

examples/acceptance_tests/087/lib/tests.ak

@@ -0,0 +1,9 @@
+use aiken/cbor.{diagnostic, serialise}
+
+test cbor_serialise_large_num() {
+  serialise(18446744073709551615) == #"c248ffffffffffffffff"
+}
+
+test cbor_diagnostic_large_num() {
+  diagnostic(18446744073709551615) == @"18446744073709551615"
+}

examples/acceptance_tests/087/plutus.json

@@ -0,0 +1,32 @@
+{
+  "preamble": {
+    "title": "aiken-lang/acceptance_test_086",
+    "version": "0.0.0",
+    "plutusVersion": "v2"
+  },
+  "validators": [
+    {
+      "title": "other.validate",
+      "datum": {
+        "title": "raw_datum",
+        "schema": {
+          "$ref": "#/definitions/Data"
+        }
+      },
+      "redeemer": {
+        "title": "_redeemer",
+        "schema": {
+          "$ref": "#/definitions/Data"
+        }
+      },
+      "compiledCode": "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",
+      "hash": "6a76fed919611638154fbaf78bd7a37f98b77e42eebc615f2d2d0f32"
+    }
+  ],
+  "definitions": {
+    "Data": {
+      "title": "Data",
+      "description": "Any Plutus data."
+    }
+  }
+}