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Yes. Use a non-interactive shell to source the script. Or, if you must use an interactive shell, invoke set +m (but this is unusual and may be a sign that you're going about things in the wrong way)....

I ran your script with bash and dash and both worked fine.

Control-C sends SIGINT to every process in the foreground process group. Non-interactive shells run everything in the same process group,...

All commands unless they are bash internals are run as a child process.

As an example try replacing the external sleep command with the internal read like this:

while :
do
echo in...

sleep invokes a wait like nanosleep() and sets a signal handler for SIGALRM.

But. /usr/bin/sleep is run in a separate child process. So, ctrl/c is sent to the child process not the parent.

It...