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* Add feature flag for const-fn functionality, which simplifies some
things and lets this crate run on architectures where atomic CAS
isn't available (e.g., thumbv6).
* Remove `const fn` where necessary to compile under rust-stable.
* BREAKING CHANGE - Change signature of `Handler::replace` to take a
mutable borrow. This is required because the underlying type is
now a NonNull, which needs `mut`. The old behavior was never
desired, but a consequence of trying to avoid `Option` by using a
default handler.
* Use lazy_static crate for initialization of Handler/HandlerArray.
* Specify Sync for Handler. This is not amazing, since it isn't, but
it's necessary for initialization in static contexts inside
`lazy_static`. This should be fine, because any actual
manipulation of the handler is done in unsafe functions.
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