I saw in the dumper that there is an array

var DEPRECATED_BOOLEANS_SYNTAX = [
  'y', 'Y', 'yes', 'Yes', 'YES', 'on', 'On', 'ON',
  'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
];

I was wondering when this deprecation was introduced and if we could remove it altogether. This code adds unwanted quotes around "y" keys for example.

Thanks for your input. I could send a PR removing this.

If you want to keep compatibility ( write a 1.2 file, but read with a 1.0/1.1 reader), maybe it could be possible to add a dump option specifying which version of reader we target.