Consider comparing the output with `cldr-json`

[movermeyer]

cldr-json is a JSON serialization of the official CLDR XML data, created by the Unicode Consortium themselves.

It doesn't contains values for everything in CLDR. For example, it only exports values with a draft level of contributed or above.

Comparing the output of ruby-cldr with the output of cldr-json might prove useful for giving confidence in the correctness of ruby-cldr.