Glide.val

You're seeing just the function val, go back to Glide module for more information.
Link to this function

val(data, options \\ [])

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Create a value from a generator.

Mostly wraps StreamData or when the function exists any of the Glide generators

Glide.val(:uuid)
Glide.val(:integer)
Glide.val(:string, :alphanumeric)