Monkey-patching string breaks core lua iterators #108

I would expect the std.string.monkey_patch() function to muck with the default string functions. I hate it, but I expect it.

I just bumped into a project where removing the monkey patch and using std.string() for all function calls that expect the relevant stdlib patched behavior still works completely differently (and crashes).

It turns out running the monkey patch function also changes other core Lua functions including reversing the default output of pairs().

This is needs to stop. Explicitly patching functions when asked is one thing, patching other things in a different scope as a side effect is not.