Dotted zeros instead of slashed zeros.

[dumol]

Font Name (Geist Sans/Geist Mono):

• [x] Geist Sans
• [x] Geist Mono

Description of the Issue: Slashed zeros are too similar to Scandinavian letter Ø.

Steps to Reproduce:

1. Compare 0 with Ø in Geist Mono.
2. Activate slash zero in Geist Sans with ss09.
3. Compare the slashed zero with Ø in Geist Sans.

Expected Behavior: For Geist Mono, use a dot inside the zero to have it easy distinguishable from both Ø and O. For Geist Sans, add a zero with a dot inside, and use that for the zero stylistic set.

Screenshots:

Environment (please complete the following information):

• OS: All
• Software: All
• Version of the Font: 1.002

Additional Context: Dotted zero is a common solution to this problem, as implemented in JetBrains Mono, IBM Plex Mono, Source Code Pro, etc.