[Bug]: Slider and Numberfield don't respect different locale with fractional steps

[spdev3000]

Code of conduct

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Impacted component(s)

Slider, Numberfield

Expected behavior

When rendering an editable slider component or Numberfield with step=0.1 it should correctly increase/decrease the value by this step when using stepper buttons or key events (arrow up/down) - in all locales.

Actual behavior

When rendering an editable slider component or Numberfield with step=0.1 changing values by stepper button or key event works correctly in en-US locale, but doesn't in other locales (such as de-DE) where different characters are used as delimiter (, instead of .)

Screenshots

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What browsers are you seeing the problem in?

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How can we reproduce this issue?

1. Go to https://studio.webcomponents.dev/edit/3kPO18Pv4S4RTLAy6Pia/src/index.ts?p=stories
2. Try adjusting the Numberfields in different locales with stepper or key events
3. See different results for different locales, en-US is working well, de-DE isn't

Sample code that illustrates the problem

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Logs taken while reproducing problem

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[najikahalsema]

Fix your value formatter !!!!! @blunteshwar