The reference dates are all day 1, so min(1, daysInMonth(...)) was always 1;
the clamp read as if the day could vary. Pass day 1 directly with a comment
explaining why no clamp is needed. No behavior change.
Found by the PR critic pass.
The conformance fixes tripped swiftlint --strict (it had been run only as
swiftformat): the test helper binding `s` is too short (now `doc`), the
duration reference dateTimes were a three-member tuple (now (year, month) with
day fixed at 1), and DurationValue.Order nested two levels deep (now the
sibling DurationOrder). No behavior change; full suite and XSTS stay green.
minInclusive, maxInclusive, minExclusive, and maxExclusive on xs:duration were
ignored: duration has no total order, so the generic comparator returned no
value and the bounds were skipped. A DurationValue now implements the XSD 1.0
Datatypes 3.2.6.2 partial order, comparing two durations by adding each to the
four reference dateTimes the spec fixes (a month is 28 to 31 days, so the order
is partial). A value incomparable to the bound, such as P1M against P30D, is
outside the ordered range and is rejected.
XSTS: invalid instances accepted 355 to 257. Baseline updated; regression tests
cover the total-order cases, the exclusive bounds, and the incomparable case.
Refs #147, #129.
