sfcminbuilder

[mpadge]

Pretty easy to extend this to sfc objects by pilfering the make_sfc function here. That would then be a the foundation of a pretty useful package in its own right, offering a very lightweight way to convert rectangular stuff into sfc objects. Happy to merge this code with your approval?

[mdsumner]

I am happy to do this, I've only done this partially in different places. :) My recent insight was to 1) keep sfg in a raw list, 2) template the overall classing of the sfc, and what you're doing here looks right!

(sf itself is admirably general with mixed types, but at the expense of most common constructors)