utils-S7.md
In ellmer: Chat with Large Language Models

prop_whole_number validates inputs

Code
  check_prop()("x")
Condition
  Error:
  ! <class> object properties are invalid:
  - @prop must be <double>, not <character>
Code
  check_prop()(c(1:2))
Condition
  Error:
  ! <class> object properties are invalid:
  - @prop must be <double>, not <integer>
Code
  check_prop()(1.5)
Condition
  Error:
  ! <class> object properties are invalid:
  - @prop must be a whole number, not the number 1.5.
Code
  check_prop(min = 1)(0)
Condition
  Error:
  ! <class> object properties are invalid:
  - @prop must be at least 1, not 0.
Code
  check_prop(max = -1)(0)
Condition
  Error:
  ! <class> object properties are invalid:
  - @prop must be at most -1, not 0.