Lists are handled unintuitively

[moqmar]

# first.yml
hello:
- world
- alex

# second.yml
hello:
- moritz

# yaml-merge first.yml second.yml
hello:
- moritz
- alex

It makes sense, as .hello[0] in first.yml gets overwritten with .hello[0] from second.yml, but when using this to merge e.g. configuration files, most people probably expect something like ["world", "alex", "moritz"] from that. If someone really wants the second behaviour, you could still allow the following YAML file to override values:

hello:
  0: moritz

To implement this, there's https://lodash.com/docs/4.17.15#mergeWith:

_.mergeWith({}, ...files, (objValue, srcValue, key, object, source, stack) => Array.isArray(objValue) && Array.isArray(srcValue) ? [...objValue, ...srcValue] : undefined)

[moqmar]

This would make yaml-merge really useful to organize Fedora CoreOS configuration files.