preamble-trim

# `preamble-trim`

There is no extra whitespace around preamble fields.

## Examples

    error[preamble-trim]: preamble header `description` has extra whitespace
     --> input.md:3:13
      |
    3 | description: Also missing
      |             ^^^^^^^^^^^^^^ value has extra whitespace
      |

## Explanation

`preamble-trim` ensures that front matter (or preamble) field values don't have extra whitespace.