KarpelesLab / strtotime / 24321516754

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More PHP quirks: unknown-TZ lookup error, bare HHMM, sequential error arrays

- parseBareTimezoneInto now returns is_localtime=true + zone_type=0 + error
  "The timezone could not be found in the database" for unknown alphabetic
  tokens that aren't months, weekdays, or known keywords.
- tryParseYearOnly interprets bare 4-digit numbers as HHMM military time
  when both components are in range (minute <= 59, hour <= 24), with
  fraction:false to match PHP (unlike colon-style time which defaults to 0).
- ParsedDate grows a fractionDefaultsZero flag; SetTime enables it and the
  HHMM path clears it so we emit fraction:0 for colon/am-pm/keyword times
  and fraction:false for bare HHMM.
- marshalMapIntString emits a JSON array (not object) when keys are a
  contiguous 0..N-1 sequence, matching PHP json_encode's "list detection".

Suite: 345 PHP parity cases.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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