Where did codepoint U+3040 come from?

[PhMajerus]

Cozette contains a glyph for U+3040:

The Unicode 16.0 chart for the Hiragana block (U+3040 - U+309F) shows that code point as unassigned.

Is there a reason for that glyph? I'm curious if there is any real-world use and why it would use an unassigned code point instead of a private use area one?
It seems to me that glyph should be removed to avoid misuse and risk of collision with future Unicode standards.

[bluetoad07]

Oh that was me lol

See #130:

• U+3040 is an unassigned space in Unicode. I put my watermark there :) You don't have to include it if you don't want to.

You're right about the collision issue though, I'll remove it in #147 #151.