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Field naming conventions top section at this URL: "u_" field names should only be used in the global scope (and the "u_" is added automatically).
Recommend adding a note to this top section to indicate this, so people avoid confusion.

Also recommend specifically calling out that the "u_" is not required for catalog or record producer variables -- the only exception is if you're directly mapping a variable from a record producer to a custom global-scope field of the same name, in which case matching the names can make things easier.

In programming, code, and style section at this URL:
recommend adding a note about pass-by-reference when interacting with GlideElement objects.
See https://pbr.snc.guru for detailed explanations and info on how to avoid it. Feel free to copy/paste chunks of that if you like.

Also recommend adding a note about gs.debug() in #9 of this section, as this should be used instead of gs.info() / gs.log(), in almost all cases of code that's being promoted to production, since it won't clutter your logs unless you enable debug logging - which is almost always desired.