Merge pull request #67 from arthurkomatsu/feat/expose-inner-mut #180

Job	Run time
Build Fuzzers	39s
Test (ubuntu-latest, stable)	38s
Test (ubuntu-latest, stable, wasm32-wasip1)	52s
Rustfmt	14s
Test (macos-latest, stable)	39s
Test (ubuntu-latest, beta)	35s
external-platform	20s
Test (ubuntu-latest, nightly)	37s
WebAssembly	20s
Test (ubuntu-latest, stable, i686-unknown-linux-gnu, i686-linux-gnu)	6m 35s
Miri	1m 18s
Test (windows-latest, stable)	1m 16s
	14m 3s

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