The serializers for FunctionReference and DynamicReference have been refactored and fixed. This includes updating conditions for properties and handling potential null values. Removed redundant converter in TestUtil following restructuring of serialization tests.

Updated and implemented multiple serializers in Linguini.Serialization to handle different types of data, including patterns, placeables, and named arguments. Additional tests were added in SerializeAndDeserializeTest.cs to verify correct serialization. Significant changes were also made to PatternSerializer and NamedArgumentSerializer.

A suite of new test cases have been added to SerializeAndDeserializeTest for comprehensive testing. Changes have been incorporated to the way of comparing Identifiers, using Identifier.Comparator for accurate comparisons.

Implemented equality logic for AstComment class in Entry.cs allowing for more complex comparisons. In addition to this, JSON deserialization has been implemented in CommentSerializer.cs allowing for reading AstComment from JSON. Now AstComment can be accurately compared and serialized from JSON format.

The commit moves the methods for variant and number literal serializations from the ResourceSerializer class to the VariantSerializer class. The move aids in organization and code readability, as variant serialization is now better isolated and number literal serialization is directly utilized in variant serialization. Exception messages for invalid inputs have also been improved during the refactoing.

Previously, all deserialization methods in the Converters threw a 'NotImplementedException'. The new updates replace these methods with actual implementations, ensuring that when serialized objects are read back, they are correctly converted back to their original form. This change improves the overall functionality and efficiency of the serialization process.

The serialization and deserialization test suite has been updated for clarity and performance. The process is now consolidated into a single method called `RoundTripTest()`. Additionally, equality implementations for `AstMessage` and `Junk` classes have been added, allowing for more reliable object comparison in tests. Implementations for processing `Junk` and `AstMessage` have been tweaked for correctness and better error reporting.