Match against all 8 PNG file signature bytes #190
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Update the PNG matcher to match all 8 bytes of the PNG signature as in:
https://www.w3.org/TR/png/#5PNG-file-signature
I'm not sure that this makes any functional difference but spotted a discrepancy and thought I'd open this PR for completeness.
As an aside, it looks like the APNG matcher matches against an identical
bytearrayto begin with - is there a reason for this difference in the two matchers?