[Slider] Mitigate floating point errors

[joaosilvalopes]

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

When step was a decimal number the calculated value form a value change was coming with floating point errors.

This fixes it by rounding the calculated value to step precision.

Closes #16151

[mui-pr-bot]

Details of bundle changes.

Comparing: 564aed3...0e3e593

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	0.00%	0.00%	318,911	318,911	87,557	87,557
@material-ui/core/Paper	0.00%	0.00%	68,281	68,281	20,353	20,353
@material-ui/core/Paper.esm	0.00%	0.00%	61,578	61,578	19,133	19,133
@material-ui/core/Popper	0.00%	0.00%	28,968	28,968	10,411	10,411
@material-ui/core/Textarea	0.00%	0.00%	5,513	5,513	2,374	2,374
@material-ui/core/TrapFocus	0.00%	0.00%	3,755	3,755	1,580	1,580
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	16,012	16,012	5,791	5,791
@material-ui/core/useMediaQuery	0.00%	0.00%	2,597	2,597	1,102	1,102
@material-ui/lab	+0.07% 🔺	+0.09% 🔺	140,480	140,574	43,417	43,454
@material-ui/styles	0.00%	0.00%	51,703	51,703	15,337	15,337
@material-ui/system	0.00%	0.00%	15,266	15,266	4,333	4,333
Button	0.00%	0.00%	84,273	84,273	25,630	25,630
Modal	0.00%	0.00%	20,345	20,345	6,689	6,689
Slider	+0.13% 🔺	+0.16% 🔺	74,587	74,681	23,184	23,221
colorManipulator	0.00%	0.00%	3,904	3,904	1,544	1,544
docs.landing	0.00%	0.00%	55,232	55,232	13,946	13,946
docs.main	0.00%	0.00%	651,017	651,017	205,042	205,042
packages/material-ui/build/umd/material-ui.production.min.js	0.00%	0.00%	292,168	292,168	83,484	83,484

Generated by 🚫 dangerJS against 0e3e593

[oliviertassinari]

@joaosilvalopes Well done.

[alitaheri]

This has broken the Slider where the precision of step is small (0.00000001) since it converts to 1e-8 not 0.00000001.

[eps1lon]

This has broken the Slider where the precision of step is small (0.00000001) since it converts to 1e-8 not 0.00000001.

Those are the same numbers just represented differently (1e-8 is scientific notation).

[oliviertassinari]

@alitaheri Do you have an idea on how we can solve this problem?

[alitaheri]

@oliviertassinari I already have. making a PR.

[oliviertassinari]

🔥