Only pass strings into component compiling steps

[jeremyroman]

Currently, some steps in "initialize a URLPattern" access potentially nonexistent entries in the processedInit map, and expect "compile a component" to receive these as null, even though it requires a string.

Instead, these entries are now always populated after calling "process a URLPatternInit" so that subsequent steps can depend on a valid string.

Since the comparison with the default port requires that the two types be the same, fix that too.

Fixes #209.

• At least two implementers are interested (and none opposed):
  • Google Chrome
  • n/a (change is simply fixing a bug in a non-controversial way, per this comment)
• Tests are written and can be reviewed and commented upon at:
  • n/a (this is a fix to how the spec expresses this, but does not represent a behavior change, and existing tests cover this behavior)
• Implementation bugs are filed:
  • Chromium: n/a (believed to work correctly in Chromium)
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1731418 (vendor does not yet implement the spec)
  • WebKit: [no known URLPattern bug] (vendor does not yet implement the spec)
  • Deno: n/a (no reason to believe a change is required)
  • kenchris/urlpattern-polyfill: n/a (no reason to believe a change is required)
• MDN issue is filed: n/a (change is on a spec detail not expressly documented)
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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💥 Error: 400 Bad Request 💥

PR Preview failed to build. (Last tried on Jan 26, 2024, 8:28 PM UTC).

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[jeremyroman]

Since pr preview was unhappy, preview link: https://api.csswg.org/bikeshed/?url=https%3A%2F%2Fraw.githubusercontent.com%2Fjeremyroman%2Furlpattern%2Fprocessedinit-absent%2Fspec.bs&force=1&md-status=LS-PR&md-Text-Macro=PR-NUMBER%20214

[sisidovski]

LGTM, thank you for handling this.