Yuya Nishihara aa4f48c7b7 config: wrap per-layer table access API
The added function is not "get_table(name) -> Result<Table, Error>" because
callers need to know whether the value was missing or shadowed by non-table
value. We just don't have this problem in template/revset-aliases because these
tables are top-level items.
2024-12-06 10:52:10 +09:00
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