Function That Errors on NULL (But Passes Thru Everything Else)

Hmm, MUST is pretty good, hadn't thought of that!

append data must select block item

One thing I've sort of flipped about on is the difference in attitudes between "English can't be a language of relevance in the post-singularity future" vs. "The advent of the Internet and Wikipedia, and English-dominance in programming culture, is hardening the language more firmly than before." Time will tell.