diff --git a/src/_parser.ts b/src/_parser.ts
index 2a53a0f..ea06b99 100644
--- a/src/_parser.ts
+++ b/src/_parser.ts
@@ -24,13 +24,13 @@ function toArr(any: any) {
 function toVal(out, key, val, opts) {
   let x;
   const old = out[key];
-  const nxt = ~opts.string.indexOf(key)
+  const nxt = opts.string.includes(key)
     ? val == undefined || val === true
-      ? ""
+      ? undefined
       : String(val)
     : typeof val === "boolean"
       ? val
-      : ~opts.boolean.indexOf(key)
+      : opts.boolean.includes(key)
         ? val === "false"
           ? false
           : val === "true" ||
@@ -121,7 +121,7 @@ export function parseRawArgs<T = Default>(
       out._.push(arg);
     } else if (arg.substring(j, j + 3) === "no-") {
       name = arg.slice(Math.max(0, j + 3));
-      if (strict && !~keys.indexOf(name)) {
+      if (strict && !keys.includes(name)) {
         return opts.unknown(arg);
       }
       out[name] = false;
@@ -142,7 +142,7 @@ export function parseRawArgs<T = Default>(
 
       for (idx = 0; idx < arr.length; idx++) {
         name = arr[idx];
-        if (strict && !~keys.indexOf(name)) {
+        if (strict && !keys.includes(name)) {
           return opts.unknown("-".repeat(j) + name);
         }
         toVal(out, name, idx + 1 < arr.length || val, opts);
diff --git a/src/args.ts b/src/args.ts
index 3d86757..2c4586f 100644
--- a/src/args.ts
+++ b/src/args.ts
@@ -10,7 +10,6 @@ export function parseArgs<T extends ArgsDef = ArgsDef>(
   const parseOptions = {
     boolean: [] as string[],
     string: [] as string[],
-    number: [] as string[],
     enum: [] as (number | string)[],
     mixed: [] as string[],
     alias: {} as Record<string, string | string[]>,
diff --git a/test/parser.test.ts b/test/parser.test.ts
index ae70c6e..6464dd3 100644
--- a/test/parser.test.ts
+++ b/test/parser.test.ts
@@ -88,4 +88,18 @@ describe("parseRawArgs", () => {
       _: [],
     });
   });
+
+  it("handles arguments with no values", () => {
+    const args = ["--name", "--specified", "--any"];
+    const opts = { string: ["name"], boolean: ["specified"] };
+    const result = parseRawArgs(args, opts);
+
+    expect("name" in result).toBeTruthy();
+    expect("specified" in result).toBeTruthy();
+    expect("any" in result).toBeTruthy();
+
+    expect(result.name).toBeUndefined();
+    expect(result.specified).toBeTruthy();
+    expect(result.any).toBeTruthy();
+  });
 });