Type catch-all HookLoader extras as <mixed, mixed>#87
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`array{...}` was an awkward stand-in for the widest input tuple type.
Since `HookLoader`'s template params are covariant, the catch-all entry
in the loaders shape can just use `mixed` for both — semantically the
widest possible, and any concrete `HookLoader<array{...}, X>` still fits.
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array{...}was an awkward stand-in for the widest input tuple type.Since
HookLoader's template params are covariant, the catch-all entryin the loaders shape can just use
mixedfor both — semantically thewidest possible, and any concrete
HookLoader<array{...}, X>still fits.