icalendar >>text<< value contains escaping (\\, \;, \,, \n): #2
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we already unescape during parsing, but we did not escape during writing
we used to fail on the second parse in "parse (to_ics (parse data))" due to
bad escaping
add a test from a real ics for this
also, TZURL is a caladdress now (URI in RFC), instead of text
use calendar_equal in test instead of polymorphic compare (which failed for
the new test case)
//cc @linse