[development] Has anything changed with module_invoke() recently?

[Nancy Wichmann]

 Ron Parker said: "Theoretically, module_invoke below should not return false, but it is"

I have recently run into problems with hook_access. It is widely misunderstood and many module return false when they really should be returning null.  I  even had to change many of my modules.  I know there are many out there that are still wrong.
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