\perp is mapped to the wrong Unicode code point

[NSoiffer]

Description

mathlive maps the TeX macro \perp to the Unicode char U+22A5 which Unicode defines as "UP TACK {base, bottom}". It should be mapped to U+27C2 which Unicode defines as "PERPENDICULAR {orthogonal to}". Although they look similar, they are slightly different.

Beside the potential subtle difference in rendering, the bad mapping means that screen readers will say the wrong thing for \perp unless they (wrongly) map U+22A5 to "perpendicular". If they do that, then they won't speak "up tack" or "bottom" when they should.

The wrong mapping is in src\latex-commands\symbols.ts:

    ['\\perp', 0x22a5],

Steps to Reproduce

1. Open https://cortexjs.io/mathlive/demo/
2. Type x \perp y
3. Select ⊥
4. Right click and choose Copy:MathML

Actual Behavior

The copied expr is <mo>⊥</mo>. The symbol is U+22A5.

Expected Behavior

It should be U+27C2.

Environment

MathLive version MathLive version 0.103.0

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

I suspect it has always been this way.

Operating System Windows 10

Browser Firefox