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# is_string2() matches on `empty`

    Code
      (expect_error(is_string2("foo", empty = 1)))
    Output
      <error/rlang_error>
      Error in `is_string2()`:
      ! `empty` must be `NULL` or a logical value.
    Code
      (expect_error(is_string2("foo", empty = NA)))
    Output
      <error/rlang_error>
      Error in `is_string2()`:
      ! `empty` must be `NULL` or a logical value.
    Code
      (expect_error(is_string2("foo", "foo", empty = TRUE)))
    Output
      <error/rlang_error>
      Error in `is_string2()`:
      ! Exactly one of `string` and `empty` must be supplied.

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