|Portability||portable (H98 + FFI)|
Control amount of compression. This is a trade-off between the amount of compression and the time and memory required to do the compression.
The default compression level is 6 (that is, biased towards high compression at expense of speed).
No compression, just a block copy.
The fastest compression method (less compression)
The slowest compression method (best compression).
A specific compression level between 1 and 9.