stabilize_arg_scalar.md
In stbl: Stabilize Function Arguments

stabilize_arg_scalar() provides informative error messages

Code
  stabilize_arg_scalar(given)
Condition
  Error:
  ! `given` must be a single <integer>.
  x `given` has 10 values.

Code
  wrapper(given)
Condition
  Error in `wrapper()`:
  ! `wrapper_val` must be a single <integer>.
  x `wrapper_val` has 10 values.

Code
  stabilize_arg_scalar(given, allow_null = FALSE)
Condition
  Error:
  ! `given` must be a single <non-NULL>.
  x `given` has no values.

Code
  wrapper(given, allow_null = FALSE)
Condition
  Error in `wrapper()`:
  ! `wrapper_val` must be a single <non-NULL>.
  x `wrapper_val` has no values.

stabilize_arg_scalar() deals with weird values

Code
  stabilize_arg_scalar(given, allow_null = c(TRUE, FALSE))
Condition
  Error:
  ! `allow_null` must be a single <logical>.
  x `allow_null` has 2 values.