You might like to look at Carp::Assert. Its assert function is liable to be slower than your test or die constructs, and it doesn't allow you to customize your die statements (unless you use its longer affirm routine, which is bound to be substantially slower.) I find it nice and readable, though. If I have time, I'll benchmark it later.
An idea you might like to steal from it is to append if DEBUG to your assertions, where DEBUG is a constant that you can set to 1 in development/testing and to 0 in production. That way, you have all of the benefits of assertions in development, and none of the overhead in production (along with none of the benefits.)
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