Polyfill: RangeError thrown when parsing calendar from time-only string

[anba]

Test case:

new Temporal.PlainDate(2025, 1, 1, "gregory").withCalendar("01").calendarId

Expected: Return the string "iso8601".
Actual: Throws a RangeError.

ParseTemporalCalendarString, step 2.b defaults to using "iso8601" when no calendar is present in the input string.

[ptomato]

Thanks for catching this. I'll submit a PR to fix the reference code. The spec text is correct, no change needed there.

As usual, the fact that this wasn't caught until now means a test262 coverage gap, so I'll keep this issue open and add the test262 label.

[ptomato]

This should also cover strings like T11:30[u-ca=gregory]. I believe those are allowed per the spec text.