0.2.3.0

• Add the ability to query the current buffer size
• Add the ability to return a value from a BufferBuilder

0.2.2.2

• Add the ability to percent-encode directly into a Utf8Builder
• Add Utf8Builder.unsafeAppendBufferBuilder

0.2.2.0

• Add the ability to encode custom types as JSON keys

0.2.1.0

• Fix a buffer overrun in the double serializer
• Add support for URL percent-encoding
• Tweak the BufferWriter struct to improve code generation