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Warning

Prime goal of this module is to produce human-readable output that can be easily
manipulated and re-used, but maybe with some occasional caveats.

One good example of such "caveat" is that e.g. {'foo': '123'} will serialize to
foo: 123, which for PyYAML would be a bug, as 123 will then be read back as an
integer from that, but here it's a feature.

So please do not rely on the thing to produce output that can always be
deserialized exactly to what was exported, at least - use PyYAML (e.g. with
options from the next section) for that.