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<p>
It's possible for a function to have both a Gleam implementation and an
external implementation. If there exists an external implementation for the
currently compiled-for target then it will be used, otherwise the Gleam
implementation is used.
</p>
<p>
This may be useful if you have a function that can be implemented in Gleam,
but there is an optimised implementation that can be used for one target. For
example, the Erlang virtual machine has a built-in list reverse function that
is implemented in native code. The code here uses this implementation when
running on Erlang, as it is then available.
</p>
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