How do language designers decide when a
feature should go in a library as an extension or when it needs to have support from the core language?
migrated from stackoverflow.com Jan 31 '11 at 9:18
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Why not read language designer's blogs?
I'm sure you could find some language designers and read their blogs.
Also, for many languages under active development, there are wikis, discussion forms and -- in some cases -- a formal "community" process. All of which you can read.
These aren't hard to find.