inefficient-state-variable-increment / inefficient-state-variable-decrement

[defidegenerate]

Why is there no inefficient-state-variable-decrement to detect the decrement case, similar to the inefficient-state-variable-increment case?

[defidegenerate]

Also, the inefficient-state-variable-increment rule doesn't apply to mapping variables based on my testing. In this case, the rule is a false positive.