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The rcfile installs its hook into PROMPT_COMMAND as an array only on bash 5.1 and up, and appends to a string below that — a version check inherited from bash-preexec. macOS still ships 3.2.57, so a developer run takes the older branch and a Linux CI runner takes the newer one. Neither machine covers both, which is worth saying in the test rather than leaving for someone to work out from a passing run.