function _curry2(fn) {
	  return function f2(a, b) {
	    switch (arguments.length) {
	      case 0:
	        return f2;
	      case 1:
	        return _isPlaceholder(a) ? f2 : _curry1(function (_b) {
	          return fn(a, _b);
	        });
	      default:
	        return _isPlaceholder(a) && _isPlaceholder(b) ? f2 : _isPlaceholder(a) ? _curry1(function (_a) {
	          return fn(_a, b);
	        }) : _isPlaceholder(b) ? _curry1(function (_b) {
	          return fn(a, _b);
	        }) : fn(a, b);
	    }
	  };
	}
function _curry2(fn) {
	  return function f2(a, b) {
	    switch (arguments.length) {
	      case 0:
	        return f2;
	      case 1:
	        return _isPlaceholder(a) ? f2 : _curry1(function (_b) {
	          return fn(a, _b);
	        });
	      default:
	        return _isPlaceholder(a) && _isPlaceholder(b) ? f2 : _isPlaceholder(a) ? _curry1(function (_a) {
	          return fn(_a, b);
	        }) : _isPlaceholder(b) ? _curry1(function (_b) {
	          return fn(a, _b);
	        }) : fn(a, b);
	    }
	  };
	}
function _curry2 ( fn ) { return function f2 ( a , b ) { switch ( arguments . length ) { case 0 : return f2 ; case 1 : return _isPlaceholder ( a ) ? f2 : _curry1 ( function ( _b ) { return fn ( a , _b ) ; } ) ; default : return _isPlaceholder ( a ) && _isPlaceholder ( b ) ? f2 : _isPlaceholder ( a ) ? _curry1 ( function ( _a ) { return fn ( _a , b ) ; } ) : _isPlaceholder ( b ) ? _curry1 ( function ( _b ) { return fn ( a , _b ) ; } ) : fn ( a , b ) ; } } ; }
Optimized internal two-arity curry function.

@private
@category Function
@param {Function} fn The function to curry.
@return {Function} The curried function.
Optimized internal two - arity curry function .