ConvertCamelCaseToKebabCase rewrites a string written in camel case (e.g.

ConvertToDNS1123SubdomainCompatibleString converts a string that doesn't conform to the definition of a subdomain in DNS (RFC 1123) to a string that conforms.

TODO: Use the stdlib version in the future, or move there if not there.

This function unions a list of maps (each can be nil or populated) by allocating a new map.

Don't use this if the unmarshalled obj is a proto message.