LemonCore.
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Master key provider backed by the macOS Keychain.
Only active on macOS: on every other platform available?/1 is false and
fetch/1 reports :unavailable, so the resolution chain moves on without
shelling out.
Tests and host applications can substitute the backing module with the
:keychain_module option; doing so bypasses the platform guard, since the
substitute is by definition not the real security(1) wrapper.