but simply return a bool indicating whether the destination received
a truncated copy of the source (true if truncation occurs else false).
The change in return value semantics allows these functions to stop
scanning the source string early when truncation occurs, stopping the
program from scanning a possibly arbitrary-length source string.
I rarely use these return values in my own programs, so it won't be
very hard to bulk convert with no risk of regressions.
Further, the different namespace allows me to not depend on the presence
or absence of strlc(py|at) in the standard libraries.
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