Ensure fp options works when applied individually.

fp/_baseConvert.js

@@ -89,7 +89,19 @@ function baseConvert(util, name, func, options) {
   };
 
   var immutWrap = function(func, cloner) {
-    return overArg(func, cloner, true);
+    return function() {
+      var length = arguments.length;
+      if (!length) {
+        return result;
+      }
+      var args = Array(length);
+      while (length--) {
+        args[length] = arguments[length];
+      }
+      var result = args[0] = cloner(args[0]);
+      func.apply(undefined, args);
+      return result;
+    };
   };
 
   var iterateeAry = function(func, n) {
@@ -107,15 +119,17 @@ function baseConvert(util, name, func, options) {
 
   var overArg = function(func, iteratee, retArg) {
     return function() {
-      var length = arguments.length,
-          args = Array(length);
-
+      var length = arguments.length;
+      if (!length) {
+        return func();
+      }
+      var args = Array(length);
       while (length--) {
         args[length] = arguments[length];
       }
-      args[0] = iteratee(args[0]);
-      var result = func.apply(undefined, args);
-      return retArg ? args[0] : result;
+      var index = config.rearg ? 0 : (length - 1);
+      args[index] = iteratee(args[index]);
+      return func.apply(undefined, args);
     };
   };
 
@@ -197,10 +211,11 @@ function baseConvert(util, name, func, options) {
               reargIndexes = mapping.iterateeRearg[name],
               spreadStart = mapping.methodSpread[name];
 
+          result = wrapped;
           if (config.fixed) {
             result = spreadStart === undefined
-              ? ary(wrapped, cap)
-              : spread(wrapped, spreadStart);
+              ? ary(result, cap)
+              : spread(result, spreadStart);
           }
           if (config.rearg && cap > 1 && (forceRearg || !mapping.skipRearg[name])) {
             result = rearg(result, mapping.methodRearg[name] || mapping.aryRearg[cap]);
@@ -221,7 +236,7 @@ function baseConvert(util, name, func, options) {
       return !result;
     });
 
-    result || (result = func);
+    result || (result = wrapped);
     if (mapping.placeholder[name]) {
       func.placeholder = result.placeholder = placeholder;
     }

test/test-fp.js

@@ -112,6 +112,41 @@
       assert.deepEqual(remove(), []);
     });
 
+    QUnit.test('should accept a variety of options', function(assert) {
+      assert.expect(8);
+
+      var array = [1, 2, 3, 4],
+          predicate = function(n) { return n % 2 == 0; },
+          value = _.clone(array),
+          remove = convert('remove', _.remove, { 'cap': false }),
+          actual = remove(function(n, index) { return index % 2 == 0; })(value);
+
+      assert.deepEqual(value, [1, 2, 3, 4]);
+      assert.deepEqual(actual, [2, 4]);
+
+      remove = convert('remove', _.remove, { 'curry': false });
+      actual = remove(predicate);
+
+      assert.deepEqual(actual, []);
+
+      var trim = convert('trim', _.trim, { 'fixed': false });
+      assert.strictEqual(trim('_-abc-_', '_-'), 'abc');
+
+      value = _.clone(array);
+      remove = convert('remove', _.remove, { 'immutable': false });
+      actual = remove(predicate)(value);
+
+      assert.deepEqual(value, [1, 3]);
+      assert.deepEqual(actual, [2, 4]);
+
+      value = _.clone(array);
+      remove = convert('remove', _.remove, { 'rearg': false });
+      actual = remove(value, predicate);
+
+      assert.deepEqual(value, [1, 2, 3, 4]);
+      assert.deepEqual(actual, [1, 3]);
+    });
+
     QUnit.test('should respect the `cap` option', function(assert) {
       assert.expect(1);