== java.net.IDN.toASCII (as used by Cronet-Android IDNStringUtil) ==

Deviation characters (transitional vs nontransitional):
  "stra\u00DFe.de"             java.net.IDN -> strasse.de
  "\u03B2\u03CC\u03BB\u03BF\u03C2.gr" java.net.IDN -> xn--nxasmq6b.gr
  "a\u200Db.example"           java.net.IDN -> ab.example
  "a\u200Cb.example"           java.net.IDN -> ab.example

Reference: WHATWG URL / Chrome url_idna_icu.cc (UTS-46 nontransitional + ContextJ):
  "stra\u00DFe.de"             -> xn--strae-oqa.de
  "\u03B2\u03CC\u03BB\u03BF\u03C2.gr" -> xn--nxasmm1c.gr
  "a\u200Db.example"           -> <rejected> (CONTEXTJ)
  "a\u200Cb.example"           -> <rejected> (CONTEXTJ)

=> For all four deviation characters, Cronet-Android resolves a DIFFERENT
   registrable domain than Chrome / WebView / any WHATWG-URL-conforming parser
   on the same device, or accepts a host that Chrome rejects outright.