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fix field-value ABNF #19
In the range 0x00-0x7F Chrome, Edge, and Firefox all seem to only do something special with 0x00, 0x0A, and 0x0D. Everything else goes. Chrome and Firefox also apply this to the range 0x7F-0xFF. Edge starts transmitting UTF-8 bytes for those "code points" instead... Safari Technology Preview restricts 0x00-0x1F and 0x7F.
It seems easiest to simply not have constrains here.