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(renv_arr): New static array to keep track of environment variables which have to be always uppercased. (idx_arr): Ditto. (start_at): Ditto. (ucreqenv): New function to uppercase only the environment variables from renv_arr. (parse_thing): Add "upcaseenv" setting. (environ_init): Parse $CYGWIN before doing anything else. Call ucreqenv instead of ucenv if CYGWIN=noupcaseenv is set.
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