903c77a665f789dfd942648fc36d4f3d3c15526a
Refine the BNF for `series` to explicitly include the `lookback_limit` and `schema`. Introduce scope management within the `bind` function for `if/else` branches to ensure correct context handling during compilation. Add `Again` and `GetField` node kinds to the `Specializer`. Improve lexer to ignore invisible characters within identifiers, demonstrated by a new test case.
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Rust
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