Leading empty line gets stripped from block scalar

[lubyou]

Hi,

Thank you for yq!

Describe the bug I am using yq to merge gitlab ci yml files.

I noticed that multi-ling strings in lists have the first line removed and a 2 inserted after the | symbol if the first line is empty.

The yaml validators I tried claim that the snippets are valid, which makes me think that this is a bug.

Version of yq: 4.18.1 Operating system: mac Installed via: homebrew

Input Yaml Concise yaml document(s) (as simple as possible to show the bug, please keep it to 10 lines or less)

broken.yml:

- |

  my
  ci commands
  here
- another command

working.yml:

- |
  my
  ci commands
  here
- another command

Command The command you ran:

yq broken.yml

Actual behavior

- |2
  my
  ci commands
  here
- another command

Expected behavior

- |

  my
  ci commands
  here
- another command

[mikefarah]

That is strange - I've found the issue logged in the underlying yaml parser yq uses: https://github.com/go-yaml/yaml/issues/701