If the module uses some form of internal storage (for caching, module level
object registration, etc.) it would be duplicated and then you could see
some interesting cache mismatch bugs.
For example in the following module 2 registries would exist rather than
the expected one if completely reloaded:
```javascript
var registeredHandlers = {};
exports.register = function (event, fn) {registeredHandlers[event] = fn;}
exports.fire = function (event) {registeredHandlers[event]();}
```
Soo... if you setup a "prestart" function, then it gets reloaded, and
someone attempts to fire "prestart" on the reloaded module; it would not
contain the function originally registered as "prestart" and be a cache
mismatch, which would be very hard to debug.
Don't introduce side effects into other authors' modules, so never ever do
this without knowing you can cause cache mismatches.
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