{{- $default := dict "boolProp" true "stringProp" "Override me" }}
{{- $explicit := dict "boolProp" false "stringProp" "String value is overriden, but bool value is not!" }}

$default:
  {{- $default | toYaml | nindent 2 }}
$explicit:
  {{- $explicit | toYaml | nindent 2 }}

# Here is the bug: `boolProp` can't be overriden with a `false` value by
# `merge`. `boolProp` should be false here (the first argument to `merge` has
# precedence, according to helm docs)
merge $explicit $default:
  {{- merge $explicit $default | toYaml | nindent 2 }}

# `mergeOverwrite` also cannot deal with bools
mergeOverwrite $default $explicit:
  {{- mergeOverwrite $default $explicit | toYaml | nindent 2 }}