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This first crossed my mind when considering whether it might be a good
idea to export the concrete implementation types of the 'basicnode'
package (see previous couple of commits -- it mostly had to do with the
question of whether we could reuse more code and shrink the size of
packages emitted by codegen)... but even though that's resolved to a
pretty solid "nope", it still makes sense to have a consistent name
prefix pattern here... and we'll probably encourage and expect to see
similar conventions in other packages (including in codegen, if we
add a handy-constructor-funcs feature to that).