diff --git a/lib/cli/options.js b/lib/cli/options.js
index 340fb01e86..fcc619a9b3 100644
--- a/lib/cli/options.js
+++ b/lib/cli/options.js
@@ -54,15 +54,26 @@ const configuration = Object.assign({}, YARGS_PARSER_CONFIG, {
 });
 
 /**
- * This is a really fancy way to ensure unique values for `array`-type
- * options.
+ * This is a really fancy way to:
+ * - ensure unique values for `array`-type options
+ * - use its array's last element for `boolean`/`number`/`string`- options given multiple times
  * This is passed as the `coerce` option to `yargs-parser`
  * @private
  * @ignore
  */
-const coerceOpts = types.array.reduce(
-  (acc, arg) => Object.assign(acc, {[arg]: v => Array.from(new Set(list(v)))}),
-  {}
+const coerceOpts = Object.assign(
+  types.array.reduce(
+    (acc, arg) =>
+      Object.assign(acc, {[arg]: v => Array.from(new Set(list(v)))}),
+    {}
+  ),
+  types.boolean
+    .concat(types.string, types.number)
+    .reduce(
+      (acc, arg) =>
+        Object.assign(acc, {[arg]: v => (Array.isArray(v) ? v.pop() : v)}),
+      {}
+    )
 );
 
 /**
diff --git a/lib/cli/run-option-metadata.js b/lib/cli/run-option-metadata.js
index f19bd57788..fbc4ea9072 100644
--- a/lib/cli/run-option-metadata.js
+++ b/lib/cli/run-option-metadata.js
@@ -45,7 +45,17 @@ exports.types = {
     'watch'
   ],
   number: ['retries'],
-  string: ['fgrep', 'grep', 'package', 'reporter', 'ui', 'slow', 'timeout']
+  string: [
+    'config',
+    'fgrep',
+    'grep',
+    'opts',
+    'package',
+    'reporter',
+    'ui',
+    'slow',
+    'timeout'
+  ]
 };
 
 /**
diff --git a/lib/cli/run.js b/lib/cli/run.js
index 0541ec6a83..da5ffd7b6a 100644
--- a/lib/cli/run.js
+++ b/lib/cli/run.js
@@ -258,13 +258,6 @@ exports.builder = yargs =>
         }
       });
 
-      types.boolean
-        .concat(types.string, types.number)
-        .filter(opt => Array.isArray(argv[opt]))
-        .forEach(opt => {
-          argv[opt] = argv[opt].pop();
-        });
-
       // yargs.implies() isn't flexible enough to handle this
       if (argv.invert && !('fgrep' in argv || 'grep' in argv)) {
         throw createMissingArgumentError(
diff --git a/test/node-unit/cli/options.spec.js b/test/node-unit/cli/options.spec.js
index 2e1e4aa09d..3c39cc7f09 100644
--- a/test/node-unit/cli/options.spec.js
+++ b/test/node-unit/cli/options.spec.js
@@ -86,7 +86,7 @@ describe('options', function() {
             config: false,
             opts: false,
             package: false,
-            retries: 3
+            retries: '3'
           })
         );
       });
@@ -202,7 +202,7 @@ describe('options', function() {
                   config: false,
                   opts: false,
                   package: false,
-                  retries: 3
+                  retries: '3'
                 }
               )
             );
@@ -427,7 +427,7 @@ describe('options', function() {
                 config: false,
                 opts: false,
                 package: false,
-                retries: 3
+                retries: '3'
               })
             );
           });
@@ -476,7 +476,7 @@ describe('options', function() {
                 config: false,
                 opts: false,
                 package: false,
-                retries: 3
+                retries: '3'
               })
             );
           });