[idna] Add unit tests for punycode prefix edge cases #374
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Helps with answering question asked in
#373
The test invariants here are based on and checked against:
Processing Step 4 of UTS#46
(http://www.unicode.org/reports/tr46/#ProcessingStepPunycode)
6.2 Decoding procedure of Punycode RFC.
(https://ietf.org/rfc/rfc3492.txt)
This change is