Command modules are easy to leak memory with

[alexcrichton]

The implementation of "command" modules in Linker will create a new Instance each time an export is invoked. This works well implementation-wise but it's also easy to leak memory and resources unintentionally. No Instance is actually deallocated until the Store is dropped, which means that commands are a vector for repeatedly creating instances by accident without ever actually deleting them.

I'm not really sure what the best way to handle this would be, but we should probably either document this or look into a fix!

cc @sunfishcode

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