module Sprockets::ProcessorUtils

def valid_processor_metadata_value?(value)

Returns true if class is in whitelist otherwise false.

value - Any Object

Internal: Validate object is in validate metadata whitelist. 
def valid_processor_metadata_value?(value)
  if VALID_METADATA_VALUE_TYPES.include?(value.class)
    true
  elsif VALID_METADATA_COMPOUND_TYPES.include?(value.class)
    value.all? { |v| valid_processor_metadata_value?(v) }
  else
    false
  end
end