Bug

In extensions/voice-call/src/providers/tts-openai.ts:85, the speed default uses || instead of ??:

this.speed = config.speed || 1.0;

Same class of bug as #39191 and #39190 — || treats 0 as falsy, so any falsy numeric value silently becomes the default.

While the current OpenAI API minimum speed is 0.25, using ?? is correct and consistent with the fixes for the STT provider.

Expected behavior

Use ?? so only undefined/null triggers the default:

this.speed = config.speed ?? 1.0;

Impact

Low — defensive fix for consistency with #39190 and #39191.