1.2.9

This is a production release of go-codec.

Changes include:

• faster growslice (as zero'ing memory only done if needed)
• make decoding via io.Reader more robust
• read and write optimizations
• clean up code across the board
• benchmark decoding for different engines against same set of encoded bytes
• improve inline'ability of code across runtime and codecgen'erated codebases

Please try it out and share your experiences.