Explicit scalars

[anthonynorth]

Could we add support for explicitly treating a vector as scalar? This is the reverse of auto_unbox = TRUE and opting out with I(); instead everything is vector and we explicitly decorate a length-1 vector as scalar. This also gives us the option of throwing errors when our "scalar" isn't length-1.

Example R to JSON:

Input

list(my_scalar = "foo", my_vector = "bar")

Output

{"my_scalar":"foo","my_vector":["bar"]}

{jsonlite}'s approach to this is to decorate scalars with a class ("scalar").

jsonlite::toJSON(list(my_scalar = jsonlite::unbox("foo"), my_vector = "bar"))

[OlaCaster]

+1 on this request; jsonlite::unbox offers great flexibility