[nawaaaaaAaar]

Summary

Fixes #1400.

Keep timedelta fractional seconds through the existing formatting logic by using total_seconds(). This is independent of the compound-unit change in #1399; this branch starts from unchanged upstream and contains no changes from that PR.

Before/after

Unchanged upstream: e2a17919f0eb988bfea2883b00793ca4d5d37c4f.

Previously, timedelta.days * 86400 + timedelta.seconds drops microseconds and floors negative durations:

• Plus 0.5 seconds: “in 0 seconds”; minus 0.5 seconds: “1 second ago”.
• Plus 1.9 seconds: “1 second”; minus 1.9 seconds: “2 seconds”.
• Plus 50.999999 seconds: “50 seconds”; minus the same magnitude: “1 minute”.

Retaining the full signed duration lets the existing rounding, threshold and minimum-unit logic handle both signs consistently, without introducing a second rounding policy.

The final regression/control matrix produces sixteen failures and twenty-eight passes against unchanged production code. It checks both signs, direction on/off, fractional rounding boundaries, the minute threshold, zero, integral durations and the maximum whole-second positive timedelta.

Verification

• Full suite on Python 3.12.13: 7,875 passed, seven skipped, two expected failures, one existing pytest deprecation warning.
• All 44 added regression/control cases pass.
• All 56 date-module doctests pass.
• Full Ruff check, source/wheel builds and whitespace checks pass.
• An isolated installed-wheel smoke test passes on Python 3.11.15, imported outside the checkout.
• Tested together with Respect preformatted string numerators in compound-unit formatting #1399 in a separate worktree: 7,893 passed, seven skipped, two expected failures, one existing pytest warning, with full Ruff checks passing. The submitted branches remain independent.

CLDR 48.2 data was imported using the repository's download/import script and checksum validation. Local verification is Linux-only and does not claim every supported runtime or hosted CI passed.

Assistance

Investigated, implemented and tested with AI assistance. No personal account-owner review or provenance attestation is asserted.

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