class Thor::Arguments

def parse_numeric(name)


Otherwise raises an error.
Check if the peek is included in enum if enum is provided.
Check if the peek is numeric format and return a Float or Integer. 
def parse_numeric(name)
  return shift if peek.is_a?(Numeric)
  unless peek =~ NUMERIC && $& == peek
    raise MalformattedArgumentError, "Expected numeric value for '#{name}'; got #{peek.inspect}"
  end
  value = $&.index(".") ? shift.to_f : shift.to_i
  if @switches.is_a?(Hash) && switch = @switches[name]
    if switch.enum && !switch.enum.include?(value)
      raise MalformattedArgumentError, "Expected '#{name}' to be one of #{switch.enum.join(', ')}; got #{value}"
    end
  end
  value
end