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0x100c6ab18
2013 Aug 18
1
How does R_UnboundValue and removing variables work?
Reading "R Internals" made me believe that R_UnboundValue was a placeholder
that would be skipped over in variable lookup. viz. the section of R
Internals "Hash tables" says "items are not actually deleted but have their
value set to R_UnboundValue.", which seems to align with what I read in
envir.c.
So, I reasoned, if I have a function that returns R_UnboundValue,