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Windows handles environment variable names case-insensitively (i.e., %Path% can be accessed via %PATH%). Since nvim explicitly creates the environment block for jobs, we need to ensure it doesn't contain duplicate names with different cases (e.g., both %Path% and %PATH%) as that can confuse processes using the environment. `f_environ()` now converts all env var names to upper-case on Windows, since it does duplicate detection and also provides the base environment for jobs. Similarly, `create_environment()` converts any env var names supplied in the job opts to upper-case so they can be compared against what we get from `f_environ()`. Closes #14541