Checks if a value is a Union.
Accepts an object whose keys are non-negative integer strings, each mapping to a per-branch Placeholder or Locales localised text map.
The value to check
True if value is a valid Union; false otherwise
value
Checks if a value is a Union.
Accepts an object whose keys are non-negative integer strings, each mapping to a per-branch Placeholder or Locales localised text map.