Raise an InvalidKeyErrors on substring of valid keys

Fixes dry-rb#705

I'm not completely sure of the fix, but it's probably good enough
as a starting point

lib/dry/validation/contract/class_interface.rb

@@ -159,7 +159,9 @@ def ensure_valid_keys(*keys)
           key_paths = key_paths(keys)
 
           invalid_keys = key_paths.map { |(key, path)|
-            unless valid_paths.any? { |vp| vp.include?(path) || vp.include?("#{path}[]") }
+            unless valid_paths.any? { |vp|
+                     vp == path || vp.include?("#{path}.") || vp.include?("#{path}[]")
+                   }
               key
             end
           }.compact.uniq

spec/integration/contract/class_interface/rule_spec.rb

@@ -167,6 +167,40 @@ def self.name
     end
   end
 
+  context "when keys are substring of valid keys" do
+    it "raises error with a list of symbol keys" do
+      expect { contract_class.rule(:details, :addres) }
+        .to raise_error(
+          Dry::Validation::InvalidKeysError,
+          "TestContract.rule specifies keys that are not defined by the schema: [:addres]"
+        )
+    end
+
+    it "raises error with a hash path" do
+      expect { contract_class.rule(details: :addres) }
+        .to raise_error(
+          Dry::Validation::InvalidKeysError,
+          "TestContract.rule specifies keys that are not defined by the schema: [{:details=>:addres}]"
+        )
+    end
+
+    it "raises error with a dot notation" do
+      expect { contract_class.rule("details.addres") }
+        .to raise_error(
+          Dry::Validation::InvalidKeysError,
+          'TestContract.rule specifies keys that are not defined by the schema: ["details.addres"]'
+        )
+    end
+
+    it "raises error with a hash path with multiple nested keys" do
+      expect { contract_class.rule(details: %i[addres]) }
+        .to raise_error(
+          Dry::Validation::InvalidKeysError,
+          "TestContract.rule specifies keys that are not defined by the schema: [{:details=>[:addres]}]"
+        )
+    end
+  end
+
   describe "abstract contract" do
     let(:abstract_contract) do
       Class.new(Dry::Validation::Contract) do