Use something other than YAML

[robrwo]

YAML 1.31 recommends using something else, such as YAML::PP.

I have experimented with switching to YAML::PP and YAML::Tiny but the tests fail to subtle differences in serialisation. Notably, some numbers are turned into strings, e.g. version: \'1.64\' instead of version: 1.64.

In experiments YAML::Tiny seems to work better as it preserves decimal places, e.g. 0.00 is not turned into 0.

(On closer inspection, YAML::Tiny does not support all of the required features.)

[robrwo]

I'm unsure if using an XS module or one that uses an external library like YAML::Syck is appropriate.

[rabbiveesh]

I don't think i'd want to make an XS module a mandatory dep, though i'd be happy for it to be an optional one that's loaded if available.