Improved Zeroize impl for BigInt's Sign
#39
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The `zeroize` crate defines a blanket impl of `Zeroize` for any type with the `DefaultIsZeroes` marker trait, which replaces the value with its `Default` using volatile writes with a memory fence. This does require defining `Default` on `Sign`, but it seems like `Sign::NoSign` is a fairly reasonable choice for a default.
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The
zeroizecrate defines a blanket impl ofZeroizefor any type with theDefaultIsZeroesmarker trait, which replaces the value with itsDefaultusing volatile writes with a memory fence.This does require defining
DefaultonSign, but it seems likeSign::NoSignis a fairly reasonable choice for a default.