[IE/Edge] "function application" vs "of" in speech strings

[pkra]

Take something like $P(u_0, u_1)$ in Struik.

On IE10/11 the subtitles will show a Unicode artifact between P and () (instead of "of"; using MathSpeak-verbose rules).
On Edge I see "of" in the subtitles.

On IE11/Win10, e.g., JAWS turns this into "function application".

Probably just an xpath fluke but here it is for the record.