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Each `stash::get` looks at every defined name, so listing the items with `keys` and then reading each with `get` took time quadratic in the number of names. A file with 20,000 hidden `_gc_macro_<i>_0` names took about ten seconds in a debug build, and the macro list reads its items this way from data that comes from the file. `stash::items(wb, prefix)` now groups the names by item in one pass and returns each item's text by key, and `keys` lists from the same pass. Both return at most `MAX_ITEMS` (10,000) items, the first keys in sorted order, so a file with any number of hidden names can't make a listing unbounded. A test counts the names each listing looks at.