Intellisense (and the "Goto definition") should make it trivial to find where things are, but I always preface the calls with a better namespace, just for clarity of reading. Then it’s clear that this is a user-defined function, not something built-in or local to the class you are working with.
Maybe there is a slight difference that I overlook, but I prefer to use common classes instead of modules for any common and standalone code - it just makes it easier for me to keep track of it, and it will also enforce your rule preceding it, since you can't just call him everywhere, not giving him a namespace.
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