diff --git a/src/components/Carousel.tsx b/src/components/Carousel.tsx
index 3a115df8..0f2b9c9d 100644
--- a/src/components/Carousel.tsx
+++ b/src/components/Carousel.tsx
@@ -62,7 +62,7 @@ function createCarouselStyles(number: number): string {
     }
 `;
 
-  const delays = Array.from({ length: number })
+  const delayList = Array.from({ length: number })
     .map((_, i) => {
       return css`
         &:nth-child(${i + 1}) {
@@ -73,6 +73,10 @@ function createCarouselStyles(number: number): string {
     `;
     })
     .join("\n");
+  const delays = css`
+    .carousel > img {
+      ${delayList}
+    }`;
 
   return css`
     .carousel > img {
@@ -88,9 +92,7 @@ function createCarouselStyles(number: number): string {
       }
     }
 
-    .carousel > img {
-      ${delays}
-    }
+    ${delays}
 
     ${keyframes}
   `;
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
index 9cd74190..b26ab36e 100644
--- a/src/components/Footer.tsx
+++ b/src/components/Footer.tsx
@@ -140,7 +140,6 @@ function RenderCategory(props: Menu): JSX.Element {
  * @param props.title - The title of the link.
  * @returns The rendered category header.
  */
-// TODO(lishaduck): Add a <Link> component to centralize anchor styling.
 function RenderCategoryHeader({ url, title }: BasicMenu): JSX.Element {
   return (
     <a
diff --git a/src/islands/Chatbot.tsx b/src/islands/Chatbot.tsx
index 7f5ee782..79a07512 100644
--- a/src/islands/Chatbot.tsx
+++ b/src/islands/Chatbot.tsx
@@ -168,8 +168,6 @@ function ChatbotBox(props: JSX.HTMLAttributes<HTMLDivElement>): JSX.Element {
       <form
         class="py-2 place-items-center"
         onSubmit={async (e) => {
-          // TODO(lishaduck): Enable moderation.
-
           e.preventDefault();
 
           if (threadId.value === undefined) {
diff --git a/src/islands/Selector.tsx b/src/islands/Selector.tsx
index 81d0b1df..bcc76071 100644
--- a/src/islands/Selector.tsx
+++ b/src/islands/Selector.tsx
@@ -22,9 +22,6 @@ export interface SelectorProps<T extends string, U extends T> {
   readonly required?: boolean;
   /** A hacky way to get Fresh to serialize the `info` prop. */
   readonly children?: ComponentChildren;
-  /** A hacky way to get Fresh *not* to serialize the `info` prop. */
-  // TODO(lishaduck): Is this really needed?
-  readonly hasInfo?: boolean;
 }
 
 export interface SelectorListObject<T extends string> {
@@ -56,7 +53,6 @@ export function Selector<T extends string, U extends T>({
   current: currentValue,
   required,
   children: info,
-  hasInfo,
 }: SelectorProps<T, U>): JSX.Element {
   const current = useSignal(
     list.find((val) => val.name === currentValue) ?? { name: "", value: "" },
@@ -109,7 +105,7 @@ export function Selector<T extends string, U extends T>({
       >
         <Label className={labelStyles}>
           {question}
-          {hasInfo && (
+          {info !== undefined && (
             <>
               {" "}
               <Info>{info}</Info>
diff --git a/src/routes/calculator/index.tsx b/src/routes/calculator/index.tsx
index a0ad4805..9346d52b 100644
--- a/src/routes/calculator/index.tsx
+++ b/src/routes/calculator/index.tsx
@@ -28,6 +28,8 @@ export const handler: Handlers<CalculatorSearchProps> = {
     _req: Request,
     ctx: FreshContextHelper<CalculatorSearchProps>,
   ): Promise<Response> {
+    // Debug is true when developing to avoid rate limiting.
+    // If you need to test this code, replace `DEBUG` with `false`.
     const visitor = DEBUG
       ? undefined
       : await getIpLocation(ctx.remoteAddr.hostname);
@@ -92,7 +94,6 @@ export default function Calculator({
             ]}
             current="horizontal"
             required
-            hasInfo={true}
           >
             See{" "}
             <a href="/solutions/geothermal/what/">
diff --git a/src/routes/calculator/results.tsx b/src/routes/calculator/results.tsx
index de381789..a09dc82e 100644
--- a/src/routes/calculator/results.tsx
+++ b/src/routes/calculator/results.tsx
@@ -20,7 +20,6 @@ import { type StateData, stateData } from "../../utils/calc/solar.ts";
 import { useCsp } from "../../utils/csp.ts";
 import type { FreshContextHelper } from "../../utils/handlers.ts";
 import { usdFormat, yearFormat } from "../../utils/intl.ts";
-import { isKey } from "../../utils/type-helpers.ts";
 
 export const config = {
   csp: true,
@@ -76,11 +75,15 @@ function parseData(
 
   if (
     geoType.success &&
-    typeof region === "string" &&
-    isKey(stateData, region)
+    region !== undefined &&
+    Object.hasOwn(stateData, region)
   ) {
     return {
-      solarRegionData: stateData[region],
+      solarRegionData:
+        stateData[
+          // See microsoft/TypeScript#44253
+          region as keyof typeof stateData
+        ],
       geoCostData: {
         isHilly: Boolean(isHilly),
         needsRenovations: Boolean(renovations),
diff --git a/src/routes/solutions/[category]/index.tsx b/src/routes/solutions/[category]/index.tsx
index 6273b73e..9bb38cbf 100644
--- a/src/routes/solutions/[category]/index.tsx
+++ b/src/routes/solutions/[category]/index.tsx
@@ -11,7 +11,7 @@ import { Meta } from "../../../components/Meta.tsx";
 import { solutions } from "../../../utils/categories.gen.ts";
 import { useCsp } from "../../../utils/csp.ts";
 import type { FreshContextHelper } from "../../../utils/handlers.ts";
-import { hasSlug, isKey } from "../../../utils/type-helpers.ts";
+import { hasSlug } from "../../../utils/type-helpers.ts";
 
 export const config = {
   csp: true,
@@ -51,7 +51,7 @@ export const handler: Handlers<CategoryProps> = {
       if (
         category === undefined ||
         category === "" ||
-        !isKey(categoryMetadata, category)
+        !Object.hasOwn(categoryMetadata, category)
       ) {
         return await ctx.renderNotFound();
       }
@@ -76,10 +76,16 @@ export const handler: Handlers<CategoryProps> = {
         }
       }
 
+      const metadata =
+        categoryMetadata[
+          // See microsoft/TypeScript#44253
+          category as keyof typeof categoryMetadata
+        ];
+
       return await ctx.render({
         pages: categoryPropsPages.parse(data),
-        title: categoryMetadata[category].title,
-        description: categoryMetadata[category].description,
+        title: metadata.title,
+        description: metadata.description,
         heros: data.map((page) => page.picture),
       });
     } catch (e) {
diff --git a/src/utils/type-helpers.ts b/src/utils/type-helpers.ts
index 05b2ddfa..df852044 100644
--- a/src/utils/type-helpers.ts
+++ b/src/utils/type-helpers.ts
@@ -3,20 +3,5 @@ import type { SolutionPage } from "./solutions.ts";
 export function hasSlug(
   data: SolutionPage,
 ): data is SolutionPage & { slug: string | undefined } {
-  return isKey(data, "slug");
-}
-
-/**
- * Check if an object has a key.
- *
- * @typeParam T - The type of the object.
- * @param obj - The object to check.
- * @param key - The key to check for.
- * @returns Whether the object has the key.
- */
-export function isKey<const T extends object>(
-  obj: T,
-  key: PropertyKey,
-): key is keyof T {
-  return Object.hasOwn(obj, key);
+  return Object.hasOwn(data, "slug");
 }