We can now recognize & normalize all time zones from the IANA time zone
database and not just 'UTC', which makes the LibJS Temporal
implementation a lot more useful! Thanks to the newly added LibTimeZone,
this was incredibly easy to implement :^)
This already includes these recent editorial changes in the Temporal
spec: 27bffe1
Previously parse_time_zone_numeric_utc_offset_syntax() would return true
to indicate success when parsing a string with an invalid number of
digits in the fractional seconds part (e.g. 23:59:59.9999999999).
We need to check if the lexer has any characters remaining, and return
false if that's the case.
Two issues:
- The format string said "{:9}", which left-pads with spaces and not
zeros as required
- Even when correcting that, we were not accounting for step 11 b:
"Set fraction to the longest possible substring of fraction starting
at position 0 and not ending with the code unit 0x0030 (DIGIT ZERO)."
We can safely use trim() for that as the formatted string is known to
not contain only zeros (which would leave the left-most in place).
Also adds tests for "UTC" and various numeric offsets.
Currently, we have NotA and NotAn, to be used dependent on whether the
following word begins with a vowel or not. To avoid this, change the
wording on NotA to be independent of this context.
