hydra-ecosystem / omegaconf / adf19255-3bbe-4083-a386-e9494691fd45

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Preserve literal keys in nested bracket interpolation (#1429)

Nested interpolation inside brackets reparsed the resolved key as path syntax, so closing brackets or backslashes could select another entry and redirect updates through aliases.

Keep each resolved bracket key as one literal component using the existing NodeInterpolationKey representation. Preserve path expansion outside brackets, relative references and sequence indices. Add regression coverage for reads, alias writes, live key changes, root keys, empty keys and integer/string list and tuple indices, plus a brief documentation clarification and release fragment.

Fixes #1425.

Validation: 493 interpolation/grammar tests and 9,304 full-suite tests pass (362 skipped), with 100% statement coverage. Ruff formatting/lint, Pyrefly checks and 100% public type coverage, generated API check and all 110 current documentation examples pass.

1 of 1 new or added line in 1 file covered. (100.0%)

5455 of 5455 relevant lines covered (100.0%)

1.0 hits per line