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Docs mention non-existent alloc feature #1038

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@elliotwaite

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@elliotwaite

The feature docs here seem to imply the existence of an alloc feature when they mention:

Versions <= 2.5.2 of the crate have no default features. Versions > 2.5.2 have the default feature ‘std’. If you are upgrading across this boundary and you have specified default-features = false, then you will need to add the ‘std’ feature or the ‘alloc’ feature to your dependency. ...

However, an alloc feature does not seem to exist.

I'm assuming this is a documentation error, since from looking at the code, it looks like if default-features = false is specified and the std feature is not enabled, then alloc-based code will be used by default instead of std-based code, but I just wanted to create this issue to confirm this, and to report the documentation error if this is the case

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