Changes

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The serialized form of maps serialized by this codec will be a JsonObject or CompoundNBT, whose fields are the key-value pairs in the map.

The serialized form of maps serialized by this codec will be a JsonObject or CompoundNBT, whose fields are the key-value pairs in the map; the map's keys will be used as the field names, and the map's values will be the values of those fields

A limitation of using unboundedMap is that it only supports key codecs that serialize to Strings (including codecs for things like ResourceLocation that aren't Strings themselves but still serialize to strings). To create a codec for a Map whose keys are not fundamentally strings, the Map must be serialized as a list of key-value entries instead of using unboundedMap. As Codec.pair() also requires that the first codec serialize to a string, the pair function cannot be used for this purpose either.

A limitation of using unboundedMap is that it only supports key codecs that serialize to Strings (including codecs for things like ResourceLocation that aren't Strings themselves but still serialize to strings). To create a codec for a Map whose keys are not fundamentally strings, the Map must be serialized as a list of key-value pairs instead of using unboundedMap.

==Equivalent Types and xmap==

==Equivalent Types and xmap==