[u7924412]

Fixes LANG-980.

DurationFormatUtils.Token compared token values with == in two places:

• Token.containsTokenWithValue(Token[], Object)
• Token.equals(Object)

This only worked because the values being compared were always the same String constant instances (y, M, d, H, m, s, S). A token holding an equal but different String instance was not recognised, which would cause formatDuration/formatPeriod to silently leave that unit out.

This PR changes both comparisons to use equals(), matching how lexx() already compares token values (previous.getValue().equals(value)).

• Token values are never null (the constructor uses Objects.requireNonNull), so calling equals() is safe.
• Literal-text tokens hold a StringBuilder, which does not override equals(), so their behaviour is unchanged.
• No public API changes.

Added testLANG980, which fails before this change and passes after it.

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[u7924412]

After opening the pull request, the project’s CI checks failed. Inspecting the logs showed the failure was unrelated to our change: seven cases of FastDatePrinterTimeZonesTest, which formats the current time, failed because the run happened during the US/Mexico daylight-saving change on 1 November 2026. Our own DurationFormatUtilsTest, including testLANG980, passed (54 tests, 0 failures).

[garydgregory]

@u7924412 Rebase on git master. Set to draft.

[garydgregory]

@u7924412
I think PR #1856 is what the Jira ticket is about. I think we can close this PR.

[garydgregory]

Closing: See above.