[b84330808]

• I have followed (at least) the PR section of the contributing guide.

With a non-integer min and an integer step, clicking or dragging the Slider lands on integers instead of the step grid. With <Slider min={0.5} max={10.5} step={1} /> the valid values are 0.5, 1.5, 2.5, … (that's where marks draws them, and what the arrow keys give), but a click at 30% sets 4 instead of 3.5.

roundValueToStep snaps to … * step + min but then rounds to the decimals of step only, so the .5 coming from min gets rounded away:

material-ui/packages/mui-material/src/Slider/useSlider.ts

Lines 125 to 128 in e19b8a5

	function roundValueToStep(value: number, step: number, min: number) {
	const nearest = Math.round((value - min) / step) * step + min;
	return Number(nearest.toFixed(getDecimalPrecision(step)));
	}

This rounds to the larger of the decimals of step and min. Added a test under prop: step that fails on master with expected … 'aria-valuenow' with the value '3.5', but the value was '4'.

I used Claude Code to write this change.

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Bundle size

Bundle	Parsed size	Gzip size
@mui/material	🔺+20B(0.00%)	🔺+9B(+0.01%)
@mui/lab	0B(0.00%)	0B(0.00%)
@mui/private-theming	0B(0.00%)	0B(0.00%)
@mui/system	0B(0.00%)	0B(0.00%)
@mui/utils	0B(0.00%)	0B(0.00%)

Details of bundle changes

Performance

No regressions in 32 benchmarks · ran 3m 06s · details

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