Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and discussions and couldn’t find anything (or linked relevant results below)

Problem

Hello! I'd like to add tel to the allowed protocols but not deviate so much from defaultUrlTransform to write my own

Current solutions

Writing your own urlTransform. I don't prefer this since I'd like to follow the default even if changes in future versions.

Proposed solutions

I'd like to propose that the safeProtocol value used in defaultUrlTransform could be passed as a parameter