whole_func_string: function(opts) {
  		opts.metrics = opts.metrics || require('./metrics').builtIns;
  		if (typeof opts.metrics === 'string') {
  			opts.metrics = opts.metrics.split(/[,;]/);
  		} else if (typeof opts.metrics === 'function') {
  			opts.metrics = [opts.metrics];
  		}
  		return opts;
  	}
func_code_string: function(opts) {
  		opts.metrics = opts.metrics || require('./metrics').builtIns;
  		if (typeof opts.metrics === 'string') {
  			opts.metrics = opts.metrics.split(/[,;]/);
  		} else if (typeof opts.metrics === 'function') {
  			opts.metrics = [opts.metrics];
  		}
  		return opts;
  	}
func_documentation_string: metrics