Order of map is nondeterministic, making read+write randomize the file

[rakudrama]

The use of a HashMap here https://github.com/dart-lang/yaml/blob/master/lib/src/equality.dart#L13
ensures that when the elements of a map are added here https://github.com/dart-lang/yaml/blob/master/lib/src/loader.dart#L156
the order is nondeterministic.

This shows itself in tools that read then write yaml - the output is needlessly reorganized.

The default behaviour should keep the input order (change HashMap to LinkedHashMap)

Sorting would be a nice option, but keeping the original order would

[shyndman]

Hello yaml maintainers,

Would you consider accepting a pull for this?

[shyndman]

Ping @rakudrama

[2dxgujun]

+1 Same problem here

[rakudrama]

• @vsmenon could we find an owner for this issue?