[pdeveltere]

assert.deepStrictEqual(), assert.deepEqual(), assert.partialDeepStrictEqual() and util.isDeepStrictEqual() consider any two Temporal objects of the same type equal, because Temporal objects keep their state in internal slots and have no own properties:

const a = Temporal.Instant.from('2026-01-01T00:00:00Z');
const b = Temporal.Instant.from('2036-01-01T00:00:00Z');

util.isDeepStrictEqual(a, b);    // true
assert.deepStrictEqual(a, b);    // passes
assert.notDeepStrictEqual(a, b); // throws

Date objects are compared by their time value for the same reason. This compares builtin Temporal objects with their equals method, and Temporal.Duration (which has no equals) field by field, so PT1H and PT60M are not equal. An object that only carries a Temporal.* tag is never equal to a builtin Temporal object.

The type checks come from internal/util/temporal, added in #63312, so this PR is stacked on it and its first commits are from that PR. Only assert,util: compare Temporal objects by value and its fixup belong to this PR. It stays a draft until #63312 lands; I'll rebase on main then.

Refs: #63312

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