PUBDEV-2: Extend test to have number or NA as the first value (test both).
PUBDEV-2: Add test for C2SChunk and fix the known bug in inflate_impl.
PUBDEV-2: Add test for C4Chunk and implement inflate_impl (was unimplemented).
PUBDEV-2: Add test for C4FChunk (and clean up inflate_impl), but disable it, since it cannot
be created from a NewChunk, which only knows about mantissa/exponent
integers/fractions or doubles.
PUBDEV-2: Allow NewChunks's addNA() to work for Float or Double Chunks.