Fix to allow debug.upvalue() to set upvalues to nil #351
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it hits the desired upvalue) and more correct (allow setting an upvalue to a falsey or nil value: debug.upvalue(fn, 'foo', nil), which is different from debug.upvalue(fn, 'foo')).
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This should make it faster (it now stops scanning when it hits the desired upvalue) and more correct. It now allows setting an upvalue to a falsey or nil value, e.g. debug.upvalue(fn, 'foo', nil) (set 'foo' to nil), which is treated differently different from debug.upvalue(fn, 'foo') (get the value of 'foo').