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While testing commit 3e51b278d, I noted that initdb leaks about a megabyte worth of data due to the sloppy bookkeeping in its string-manipulating code. That's not a huge amount on modern machines, but it's still kind of annoying, and it's easy to fix by recognizing that we might as well treat these arrays of strings as modifiable-in-place. There's no caller that cares about preserving the old state of the array after replace_token or replace_guc_value. With this fix, valgrind sees only a few hundred bytes leaked during an initdb run. Discussion: https://postgr.es/m/2844176.1674681919@sss.pgh.pa.us