Thanks for your comments.
"Finally, there may be memory limits in the actual textarea within the
browser and perhaps even the editor itself ... I don't know what these
might be (might be something you want to find for us, WP)."
OK! I will put this on my task list. I just found out about all this while trying to load large documents into some CMSs and Moodle.
I just wanna say - Praise to you Janne!!
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