Coerce to key or value in objects in a key-value pair

Functions to check if an object is a valid key or value in a keyvalue pair, or coerce it if possible.

as.key(x)

is.key(x)

as.value(x)

is.value(x)

Arguments

x	a vector

Value

as.value returns a value-object (currently the vector itself but with class "value"). as.key returns a key-object (building on value but with unique entries and as character).