It's a bit ugly to have both strdup_to() and strdup_to_full(). I initially started with one variant, but then in some functions we want the additional info, while in many other places, having 1 instead of 0 causes the return value of whole chains of functions to be changed. It *probably* wouldn't cause any difference, but there is at least of bunch of tests that would need to be updated, so in the end it seems to have the two variants. The output param is first to match free_and_strdup() and other similar functions.
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