Suggest ommiting sub keys with dot notation

[andyjamesn]

This is a suggestion to be able to omit nested values in the state.

Example omit: ['editor.color'] instead of just omit: ['editor']

I tested this out and this seems to work, but I am not completely sure if this is all that is needed or if there is something else I may have missed.

function removeOmittedKeys(
  options: Options,
  store: Store,
  serializer: Serializer = { serialize: JSON.stringify, deserialize: JSON.parse },
): Store['$state'] {
  const clone = serializer.deserialize(serializer.serialize(store.$state))
  if (options.undo && options.undo.omit) {
    options.undo.omit.forEach((key) => {
      if (key.includes('.')) {
        const keys = key.split('.')
        let obj = clone
        for (let i = 0; i < keys.length - 1; i++) {
          obj = obj[keys[i]]
        }
        delete obj[keys[keys.length - 1]]
        return
      }
      delete clone[key]
    })
    return clone
  }
  return clone
}