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Why wouldn't all my C functions share the same environment ? What
operations change this environment ?

Sorry for any confusion Gaspard, only lua_setfenv() changes the environment so you should be fine if you don't call lua_setfenv(). My confusion when I last worked with function/userdata environments came from the fact that my C functions inherited their environment from the C module loader and this surprised me (although it's more or less documented) but in retrospect this doesn't seem relevant to your question.

 - Peter Odding