mess with the code until tests pass and it's faster

[LilithHafner]

trades technical debt for performance.
probably not a good idea to merge now.

these changes were based mostly on benchmarks and tests and not on understanding semantics and performance characteristics. It's quite plausible it adds bugs or performance holes.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.38%. Comparing base (f16eec8) to head (7e82642).
Report is 5 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   99.35%   99.38%   +0.02%     
==========================================
  Files           1        1              
  Lines         468      484      +16     
==========================================
+ Hits          465      481      +16     
  Misses          3        3              

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[LilithHafner]

master	In Memory
		incompressible	huffman	runlength	graph
small	deflate	2.0	2.9	3.7	2.3
	zlib	2.9	2.8	4.0	2.4
	gzip	4.1	3.0	3.5	2.5
medium	deflate	1.6	3.2	2.7	3.2
	zlib	3.7	3.5	2.9	3.2
	gzip	5.0	3.5	3.3	3.5
large	deflate	4.8	3.4	2.6	3.3
	zlib	3.7	3.4	2.6	3.4
	gzip	5.0	3.7	3.2	3.6

master	Streaming
		incompressible	huffman	runlength	graph
small	deflate	1.8	3.7	3.6	3.3
	zlib	3.3	4.1	4.0	3.9
	gzip	4.4	4.2	4.3	4.2
medium	deflate	4.2	4.0	3.5	4.2
	zlib	3.8	4.1	4.0	4.4
	gzip	4.8	4.2	4.0	4.2
large	deflate	4.1	3.7	3.3	3.9
	zlib	4.1	4.0	3.6	4.1
	gzip	5.1	3.9	3.5	3.9

pr	In Memory
		incompressible	huffman	runlength	graph
small	deflate	2.0	2.7	3.6	2.2
	zlib	2.8	2.9	3.8	2.3
	gzip	4.1	2.8	3.3	2.3
medium	deflate	1.4	3.0	2.3	2.8
	zlib	3.6	3.0	2.6	3.0
	gzip	5.1	3.1	3.0	3.3
large	deflate	2.9	2.9	2.3	2.9
	zlib	3.9	3.1	2.6	3.1
	gzip	5.3	3.3	3.1	3.3

pr	Streaming
		incompressible	huffman	runlength	graph
small	deflate	2.2	3.3	3.3	3.1
	zlib	3.8	3.7	3.8	3.8
	gzip	3.9	3.6	4.4	3.8
medium	deflate	3.9	3.5	3.3	3.9
	zlib	3.8	3.9	3.6	4.2
	gzip	4.8	3.7	3.4	4.0
large	deflate	6.7	3.3	2.9	3.5
	zlib	4.0	3.6	3.1	3.9
	gzip	5.3	3.5	3.2	3.6