Rework long.ToMetric for correct interpretation of decimals parameter#1700

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logiclrd wants to merge 7 commits into

Humanizr:mainfrom

logiclrd:tometric-long-redux

Commits on May 26, 2026

Expanded the test cases for long.ToMetric in MetricNumeralTests.cs to be much more comprehensive by using a TheoryData generator, reworking it to follow the correct interpretation of the decimals p…
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Added test cases to GenerateLongToMetricTestCases in MetricNumeralTests.cs to exercise cases where the rounding direction matters, with values that match expected behaviour for int.ToMetric and dou…
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Added missing condition.
logiclrd
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Added test cases to GenerateLongToMetricTestCases in MetricNumeralTests.cs to exercise scale changes necessitated by rounding (999.9 => 1000).
logiclrd
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Updated the long.BuildRepresentation extension overload in MetricNumeralExtensions.cs that discovers scale to not force decimals onto numbers that don't require scaling.
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Updated tests in GenerateLongToMetricTestCases in MetricNumeralTests.cs to exercise exact midpoint rounding cases.
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Updated ByteSizeAndMetricNumeralCoverRemainingPublicFormattingBranches in CoverageGapTests.cs to track the correction in the interpretation of the decimals parameter to long.ToMetric.
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