Reproduction

Use StackBlitz to reproduce your issue:
https://stackblitz.com/edit/harness-issue-7whdxy?devtoolsheight=33&file=src/app/button-harness-example.spec.ts

Steps to reproduce:

1. Have an input with type = "number"
2. Try to set input value to a numeric value via matInputHarness.setValue(24)
   or try to read a numeric value via matInputHarness.getValue().

Expected Behavior

I can read and set values as numbers (not strings), as numbers would appear in FormControl when user interacts with <input type="number">.

Actual Behavior

I can only set and read values as strings.

Environment

• Angular: 12
• CDK/Material: 12
• Browser(s): Firefox
• Operating System (e.g. Windows, macOS, Ubuntu): Ubuntu