What's this thing that shows up when you shift click on input options?

When you shift click on the options for inputs, there is one called "extension" with a single option called "numbers". I've always wondered why it's there.

The Numbers menu (the only option in the Extensions menu) is a special menu that is used by 2 blocks in the colors and crayons library.
image

The reason it's there, is because it's a special menu that uses javascript, which chooses what the menu should be, depending on what is in the first input.

For anyonw who is wondering, here's what @bombmanyeeted is refering to
image

(For some reason the checkboxes are snap icons in the options menu, but are emojis everywhere else.)

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