See here as to - Definition from the Merriam-Webster Online Dictionary
Date: 14th century
1 : as for, about <at a loss as to how to explain the error>
2 : according to, by <graded as to size and color>
See also as to - Definitions from Dictionary.com
19. as for or to, with respect to; in reference to: As for staying away, I wouldn't think of it.
And go so far as to - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.
go so far as to do something
to be extreme in talking about or doing something. They went so far as to threaten violence if we did not pay them.
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