\iff cause range error

[gunnarmein-ts]

Description

latex \iff causes stack overflow

Steps to Reproduce

• go to https://cortexjs.io/mathlive/demo/
• open debugger
• type '\iff' in latex field
• watch error in the debugger console

Actual Behavior

crash, unexpected display

Expected Behavior

should become "\Longleftrightarrow"

Environment

Is this a regression: did it use to work in a previous version?
worked correctly in 0.93.0

MathLive version 0.98.5
Operating System macOS Sonoma (also happens on github Ubuntu test runner)
Browser Chrome

[QuinnStraus]

Just independently discovered this bug as well, it worked for me in 0.98.4 but once I upgraded to 0.98.5 it crashed. I got one error that said "TypeError: window.MathfieldElement.isFunction is not a function" when calling the validateLatex utility on the field, if that helps in diagnosing the problem.
I also noticed another problem with \iff in 0.98.4 where calling getValue("latex-expanded") on the mathfield would always add a ";" space on either side of the \iff, which was slightly annoying and might also be related.