YAML: consider starting # and ending : as quotable characters

[MikeEdgar]

Scalar values starting with # or ending with : should be quoted. Currently, SnakeYAML will single-quote them automatically. This change will proactively trigger the double quote style used for other values that require quotes when MINIMIZE_QUOTES is enabled.

[cowtowncoder]

Looks good, will make some minor tweaks before merging but idea makes sense (change was subtle had to look carefully :) ).

[cowtowncoder]

@MikeEdgar one procedural thing before merging: if we don't yet have CLA (only needs to be sent once for all contributions, before merging the first), it's here:

https://github.com/FasterXML/jackson/blob/master/contributor-agreement.pdf

and it's usually easiest to print, fill & sign, scan/photo, email to cla at fasterxml dot com.
Once we have it I'll go ahead and merge this.

Thank you very much for contributing this (esp. great to have test coverage); looking forward to merging it.

[oliversaggau]

I'm not quite sure if this is/was desired behavior, as the original description only states

Scalar values starting with # or ending with : should be quoted.

But upgrading springdoc in our project to version 1.8.0 (which uses jackson version 2.17 with this change) in our project resulted in all scalar values being double-quoted instead of single-quoted in the generated .yaml file, not only the ones starting with # or ending with : Nevermind me, it indeed only affected values starting with #. Just ignore my comment 🙈

[cowtowncoder]

@oliversaggau Thank you for double-checking :)