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![Manav Rathi](https://secure.gravatar.com/avatar/6232eecfd05cb56654ba3a8faae414f6.jpg?s=96&d=mm)
Manav Rathi committed 830bc28c450
FS-7352: Document how to use switch_core_set_variable to delete variables I had to scan through the source of the function to verify that this is the indeed the actual behaviour, and that NULL is a valid argument. By mentioning this in the header, we save posterity that effort.