'''dict incr''' ''dictionaryVariable'' ''key'' ''?increment?''

This adds the given increment value (an integer that
defaults to 1 if not specified) to the value that the given
key maps to in the dictionary value contained in the given
variable, writing the resulting dictionary value back to
that variable. Non-existent keys are treated as if they map
to 0. It is an error to increment a value for an existing
key if that value is not an integer.


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