Use AREF, ASET and ASIZE macros.
(Fmake_sparse_keymap): Docstring fix. (synkey): Remove. (shadow_lookup): Move up. Handle the case where lookup-key returns an integer. (where_is_internal_1): Drop arg `keymap'. Don't check shadowing. (where_is_internal_2): Adapt to fewer args for where_is_internal_1. (Fwhere_is_internal): Allow `xkeymap' to be a list of keymaps. Simplify/rewrite the keymap-finding code. Add check for command shadowing, using shadow_lookup.
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