diff --git a/deno/lib/README.md b/deno/lib/README.md
index 640ed564c..46bde68ca 100644
--- a/deno/lib/README.md
+++ b/deno/lib/README.md
@@ -599,11 +599,11 @@ z.string().regex(regex);
 z.string().startsWith(string);
 z.string().endsWith(string);
 z.string().trim(); // trim whitespace
-z.string().toLowerCase(); // toLowerCase
-z.string().toUpperCase(); // toLowerCase
 z.string().datetime(); // defaults to UTC, see below for options
 z.string().ip(); // defaults to IPv4 and IPv6, see below for options
 ```
+<!-- z.string().toLowerCase(); // toLowerCase -->
+<!-- z.string().toUpperCase(); // toUpperCase -->
 
 > Check out [validator.js](https://github.com/validatorjs/validator.js) for a bunch of other useful string validation functions that can be used in conjunction with [Refinements](#refine).
 
diff --git a/deno/lib/benchmarks/index.ts b/deno/lib/benchmarks/index.ts
index fa6525ea1..1ce4e755e 100644
--- a/deno/lib/benchmarks/index.ts
+++ b/deno/lib/benchmarks/index.ts
@@ -1,3 +1,5 @@
+import Benchmark from "benchmark";
+
 import discriminatedUnionBenchmarks from "./discriminatedUnion.ts";
 import objectBenchmarks from "./object.ts";
 import primitiveBenchmarks from "./primitives.ts";
@@ -5,13 +7,39 @@ import realworld from "./realworld.ts";
 import stringBenchmarks from "./string.ts";
 import unionBenchmarks from "./union.ts";
 
-for (const suite of [
-  ...realworld.suites,
-  ...primitiveBenchmarks.suites,
-  ...stringBenchmarks.suites,
-  ...objectBenchmarks.suites,
-  ...unionBenchmarks.suites,
-  ...discriminatedUnionBenchmarks.suites,
-]) {
+const argv = process.argv.slice(2);
+let suites: Benchmark.Suite[] = [];
+
+if (!argv.length) {
+  suites = [
+    ...realworld.suites,
+    ...primitiveBenchmarks.suites,
+    ...stringBenchmarks.suites,
+    ...objectBenchmarks.suites,
+    ...unionBenchmarks.suites,
+    ...discriminatedUnionBenchmarks.suites,
+  ];
+} else {
+  if (argv.includes("--realworld")) {
+    suites.push(...realworld.suites);
+  }
+  if (argv.includes("--primitives")) {
+    suites.push(...primitiveBenchmarks.suites);
+  }
+  if (argv.includes("--string")) {
+    suites.push(...stringBenchmarks.suites);
+  }
+  if (argv.includes("--object")) {
+    suites.push(...objectBenchmarks.suites);
+  }
+  if (argv.includes("--union")) {
+    suites.push(...unionBenchmarks.suites);
+  }
+  if (argv.includes("--discriminatedUnion")) {
+    suites.push(...discriminatedUnionBenchmarks.suites);
+  }
+}
+
+for (const suite of suites) {
   suite.run();
 }
diff --git a/src/benchmarks/index.ts b/src/benchmarks/index.ts
index 4ed7ea88c..a56c69673 100644
--- a/src/benchmarks/index.ts
+++ b/src/benchmarks/index.ts
@@ -1,3 +1,5 @@
+import Benchmark from "benchmark";
+
 import discriminatedUnionBenchmarks from "./discriminatedUnion";
 import objectBenchmarks from "./object";
 import primitiveBenchmarks from "./primitives";
@@ -5,13 +7,39 @@ import realworld from "./realworld";
 import stringBenchmarks from "./string";
 import unionBenchmarks from "./union";
 
-for (const suite of [
-  ...realworld.suites,
-  ...primitiveBenchmarks.suites,
-  ...stringBenchmarks.suites,
-  ...objectBenchmarks.suites,
-  ...unionBenchmarks.suites,
-  ...discriminatedUnionBenchmarks.suites,
-]) {
+const argv = process.argv.slice(2);
+let suites: Benchmark.Suite[] = [];
+
+if (!argv.length) {
+  suites = [
+    ...realworld.suites,
+    ...primitiveBenchmarks.suites,
+    ...stringBenchmarks.suites,
+    ...objectBenchmarks.suites,
+    ...unionBenchmarks.suites,
+    ...discriminatedUnionBenchmarks.suites,
+  ];
+} else {
+  if (argv.includes("--realworld")) {
+    suites.push(...realworld.suites);
+  }
+  if (argv.includes("--primitives")) {
+    suites.push(...primitiveBenchmarks.suites);
+  }
+  if (argv.includes("--string")) {
+    suites.push(...stringBenchmarks.suites);
+  }
+  if (argv.includes("--object")) {
+    suites.push(...objectBenchmarks.suites);
+  }
+  if (argv.includes("--union")) {
+    suites.push(...unionBenchmarks.suites);
+  }
+  if (argv.includes("--discriminatedUnion")) {
+    suites.push(...discriminatedUnionBenchmarks.suites);
+  }
+}
+
+for (const suite of suites) {
   suite.run();
 }