IRREGULARITIES. Double negativeDouble Negative.--Many irregularities may be explained by the desire of emphasis which suggests repetition, even where repetition, as in the case of a negative, neutralizes the original phrase:
“First he denied you had in him no right.
“You may deny that you were not the cause.
“No sonne, were he 1 never so old of yeares, might not
“Forbade the boy he should not pass these bounds.
marry.” ASCH. 37. This idiom is a very natural one, and quite common in E. E. Double Comparative and Superlative. See Adjectives, 11.