bug(Slider): Jaws and NVDA incorrectly announcing decimal numbers

[Aivanic]

Reproduction

https://stackblitz.com/edit/components-issue-nr5zgy?file=src%2Fapp%2Fexample-component.html
(stackblitz have weird behaviour, you have to add tabindex="0" for working example)

Steps to reproduce:

1. Enable Jaws or NVDA
2. Focus slider
3. Move slider

Expected Behavior

Screen reader announce 0.2

Actual Behavior

Screen reader announcing e.g. 0.20000068

Environment

• Angular: V. 10.1.3
• CDK/Material: V. 10.2.3
• Browser(s): Google Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows 10

[crisbeto]

Reopening since the fix had to be reverted.