What about stuff that is so specific to your project that it can't be exported as a library on it's own? Most of the helpers on my projects are very small and contain only few methods - I can't see how you would export such helpers as libraries and keep their usability.
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What about stuff that is so specific to your project that it can't be exported as a library on it's own? Most of the helpers on my projects are very small and contain only few methods - I can't see how you would export such helpers as libraries and keep their usability.