stepper.md
In almanac: Tools for Working with Recurrence Rules

must be integerish `n`

Code
  step(1.5)
Condition
  Error in `step()`:
  ! Can't convert from `n` <double> to <integer> due to loss of precision.
  * Locations: 1

`n` is validated

Code
  new_stepper(1)
Condition
  Error in `new_stepper()`:
  ! `n` must be an integer.

`rschedule` is validated

Code
  new_stepper(rschedule = 1)
Condition
  Error in `new_stepper()`:
  ! `rschedule` must be a <almanac_rschedule>, not the number 1.

default method error is thrown

Code
  (expect_error(vec_arith("+", new_stepper(), 1), class = "vctrs_error_incompatible_op")
  )
Output
  <error/vctrs_error_incompatible_op>
  Error in `vec_arith()`:
  ! <stepper> + <double> is not permitted
Code
  (expect_error(vec_arith("+", 1, new_stepper()), class = "vctrs_error_incompatible_op")
  )
Output
  <error/vctrs_error_incompatible_op>
  Error in `vec_arith()`:
  ! <double> + <stepper> is not permitted

cannot subtract date from stepper

Code
  step(1) %s-% x
Condition
  Error in `vec_arith()`:
  ! <stepper> - <date> is not permitted

steppers are coercible if from the same rschedule

Code
  vec_ptype2(x, new_stepper())
Condition
  Error in `vec_ptype2.almanac_stepper.almanac_stepper()`:
  ! Can't combine `x` <stepper> and `new_stepper()` <stepper>.
  Steppers must have identical rschedules to be coercible.

Code
  vec_cast(x, new_stepper())
Condition
  Error in `vec_cast.almanac_stepper.almanac_stepper()`:
  ! Can't convert `x` <stepper> to <stepper>.
  Steppers must have identical rschedules to be coercible.