module Psych

def self.load_file filename, fallback: false

the specified +fallback+ return value, which defaults to +false+.
+filename+ as a Ruby object, or if the file is empty, it returns
Load the document contained in +filename+. Returns the yaml contained in
## 
def self.load_file filename, fallback: false
  File.open(filename, 'r:bom|utf-8') { |f|
    self.load f, filename, fallback: FALLBACK.new(fallback)
  }
end