BUG: Fix tiny memory leaks when like=
overrides are used
#18461
Merged
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Backport of #18420.
I thought I had fixed these leaks, but it appears I missed some.
We probably should backport this to 1.20.x (its simple), but the leaks
are also pretty harmless unless someone uses
like=
hundrets ofthousands of times in a running program (and its a new fetaure).