v0.5.7: patch release with improved PHP compatibility
v0.4.7: Fixes deprecated ternary operator usage
v0.5.6 minor release, with new Buffer::gmp function
ByteString: minor fix, should accept BufferInterface, not just Buffer
VarInt: performance bump using pack
Uint32: speedup using pack
VarInt: further performance improvement using pack
ByteString: rewrite for performance