Slider prop `step` does not include `null` as possible type in TS

[Owen-Tsai]

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• [x] I have searched the issues of this repository and believe (hopefully) that this is not a duplicate.

Version

4.2.3

Environment

Vue 3.4.29, AntD 4.2.3

Reproduction link

Not applicable

Steps to reproduce

<ASlider
  :step="null"
  ^^^^^ 不能将 null 分配给 number | undefined
/>

What is expected?

null should be included in step prop types.

What is actually happening?

TS server throws an error when you trying to assign null to step.

[webvs2]

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