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reverts use of NonZeroUsize for LRU capacity instead of usize #176

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reverts use of NonZeroUsize for LRU capacity instead of usize #176

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behzadnouri
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NonZeroUsize for capacity is very nonergonomic and prevents some use-cases. For example a usize allows to disable caching by using capacity zero. see: #165

This reverts commit 0e415ef.

@behzadnouri
reverts use of NonZeroUsize for LRU capacity instead of usize
4fa447d 
NonZeroUsize for capacity is very nonergonomic and prevents some
use-cases. For example a usize allows to disable caching by using
capacity zero. see: jeromefroe#165

This reverts commit 0e415ef.
@behzadnouri
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With this change get_or_insert, get_or_insert_mut and try_get_or_insert now may return None if the capacity is zero.
That is addressed in #177.

@jeromefroe

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