String quoting differs between 2.0.0 and 2.0.8

[segiddins]

In v2.0.0, which I believe shipped by default with Ruby 2.0, h = { k: './Hello' } would serialize to ---\n:k: ./Hello\n, whereas in 2.0.8, which I have on my 2.2.1 install, it serializes to ---\n:k: "./Hello"\n -- note the added quotes in the later version. This causes unwanted diffs when the same file is serialized by different ruby versions.

[segiddins]

@tenderlove this is a breaking change for CocoaPods' users, it would be nice to know if there's anything we can do about it

[tenderlove]

Sorry, how is this a "breaking change"?

[segiddins]

Because the generated YAML strings are unequal (and thus textual diffing fails)

[tenderlove]

Psych never makes a guarantee that the output will always be the same. It guarantees that any object you serialize will deserialize the same way, so I don't consider this to be a "breaking change". I am open to a patch that would make strings serialize how you want, but I reiterate: psych makes no guarantees about what the output YAML will look like, only that an object can serialize and deserialize successfully.