diff --git a/config/formats.ts b/config/formats.ts
index 534112a06c..4b35444b36 100644
--- a/config/formats.ts
+++ b/config/formats.ts
@@ -1193,7 +1193,7 @@ export const Formats: FormatList = [
 
 			const mixedSpecies = this.dex.deepClone(species);
 			mixedSpecies.weightkg =
-				parseInt(Math.max(0.1, +(species.weightkg + crossSpecies.weightkg - crossPrevoSpecies.weightkg)).toFixed(1));
+				Math.max(0.1, +(species.weightkg + crossSpecies.weightkg - crossPrevoSpecies.weightkg)).toFixed(1);
 			mixedSpecies.nfe = false;
 			mixedSpecies.evos = [];
 			mixedSpecies.eggGroups = crossSpecies.eggGroups;
diff --git a/data/mods/gen1/rulesets.ts b/data/mods/gen1/rulesets.ts
index 6c4553578d..1e5edd92a9 100644
--- a/data/mods/gen1/rulesets.ts
+++ b/data/mods/gen1/rulesets.ts
@@ -17,7 +17,7 @@ export const Rulesets: {[k: string]: ModdedFormatData} = {
 			const bst = newSpecies.bst;
 			if (bst <= 350) {
 				newSpecies.bst = 0;
-				for (const stat of Stats.statIDs) {
+				for (const stat in newSpecies.baseStats) {
 					if (stat === 'spd') continue;
 					newSpecies.baseStats[stat] = this.clampIntRange(newSpecies.baseStats[stat] * 2, 1, 255);
 					newSpecies.bst += newSpecies.baseStats[stat];
@@ -43,8 +43,8 @@ export const Rulesets: {[k: string]: ModdedFormatData} = {
 				spd: newSpecies.baseStats.atk,
 				spe: newSpecies.baseStats.hp,
 			};
-			for (const statName of Stats.statIDs) {
-				newSpecies.baseStats[statName] = stats[statName];
+			for (const i in newSpecies.baseStats) {
+				newSpecies.baseStats[i] = stats[i];
 			}
 			return newSpecies;
 		},
@@ -61,7 +61,7 @@ export const Rulesets: {[k: string]: ModdedFormatData} = {
 			const pst: number = newSpecies.bst - newSpecies.baseStats['hp'];
 			const scale = 500 - newSpecies.baseStats['hp'];
 			newSpecies.bst = newSpecies.baseStats['hp'];
-			for (const stat of Stats.statIDs) {
+			for (const stat in newSpecies.baseStats) {
 				if (stat === 'hp' || stat === 'spd') continue;
 				newSpecies.baseStats[stat] = this.clampIntRange(newSpecies.baseStats[stat] * scale / pst, 1, 255);
 				newSpecies.bst += newSpecies.baseStats[stat];
diff --git a/data/mods/gen7mixandmega/scripts.ts b/data/mods/gen7mixandmega/scripts.ts
index 431c41f82c..44cf1eb9e9 100644
--- a/data/mods/gen7mixandmega/scripts.ts
+++ b/data/mods/gen7mixandmega/scripts.ts
@@ -99,11 +99,10 @@ export const Scripts: ModdedBattleScriptsData = {
 				species.types = [species.types[0], deltas.type];
 			}
 			const baseStats = species.baseStats;
-			for (const statName of Stats.statIDs) {
+			for (const statName in baseStats) {
 				baseStats[statName] = this.battle.clampIntRange(baseStats[statName] + deltas.baseStats[statName], 1, 255);
 			}
 			species.weighthg = Math.max(1, species.weighthg + deltas.weighthg);
-			// @ts-ignore originalMega is not a defined property of the Species class, but we need to add it here
 			species.originalMega = deltas.originalMega;
 			species.requiredItem = deltas.requiredItem;
 			if (deltas.isMega) species.isMega = true;
diff --git a/data/mods/mixandmega/scripts.ts b/data/mods/mixandmega/scripts.ts
index 7263d3e4e7..8aa985f35f 100644
--- a/data/mods/mixandmega/scripts.ts
+++ b/data/mods/mixandmega/scripts.ts
@@ -95,12 +95,10 @@ export const Scripts: ModdedBattleScriptsData = {
 				species.types = [species.types[0], deltas.type];
 			}
 			const baseStats = species.baseStats;
-			let statName: StatID;
-			for (statName in baseStats) {
+			for (const statName in baseStats) {
 				baseStats[statName] = this.battle.clampIntRange(baseStats[statName] + deltas.baseStats[statName], 1, 255);
 			}
 			species.weighthg = Math.max(1, species.weighthg + deltas.weighthg);
-			// @ts-ignore
 			species.originalMega = deltas.originalMega;
 			species.requiredItem = deltas.requiredItem;
 			if (deltas.isMega) species.isMega = true;
diff --git a/data/rulesets.ts b/data/rulesets.ts
index f9ad0370ca..5c63d32df0 100644
--- a/data/rulesets.ts
+++ b/data/rulesets.ts
@@ -1384,7 +1384,7 @@ export const Rulesets: {[k: string]: FormatData} = {
 			const newSpecies = this.dex.deepClone(species);
 			if (newSpecies.bst <= 350) {
 				newSpecies.bst = 0;
-				for (const stat of Stats.statIDs) {
+				for (const stat in newSpecies.baseStats) {
 					newSpecies.baseStats[stat] = this.clampIntRange(newSpecies.baseStats[stat] * 2, 1, 255);
 					newSpecies.bst += newSpecies.baseStats[stat];
 				}
@@ -1404,7 +1404,7 @@ export const Rulesets: {[k: string]: FormatData} = {
 			const newSpecies = this.dex.deepClone(species);
 			const reversedNums = Object.values(newSpecies.baseStats).reverse();
 			for (const [i, statName] of Object.keys(newSpecies.baseStats).entries()) {
-				newSpecies.baseStats[statName as StatID] = reversedNums[i];
+				newSpecies.baseStats[statName] = reversedNums[i];
 			}
 			return newSpecies;
 		},
@@ -1422,7 +1422,8 @@ export const Rulesets: {[k: string]: FormatData} = {
 			const bstWithoutHp: number = newSpecies.bst - newSpecies.baseStats['hp'];
 			const scale = 600 - newSpecies.baseStats['hp'];
 			newSpecies.bst = newSpecies.baseStats['hp'];
-			for (const stat of Stats.statIDsExceptHP) {
+			for (const stat in newSpecies.baseStats) {
+				if (stat === 'hp') continue;
 				newSpecies.baseStats[stat] = this.clampIntRange(newSpecies.baseStats[stat] * scale / bstWithoutHp, 1, 255);
 				newSpecies.bst += newSpecies.baseStats[stat];
 			}
@@ -1852,7 +1853,8 @@ export const Rulesets: {[k: string]: FormatData} = {
 			pokemon.bst = pokemon.baseStats['hp'];
 			const boost = boosts[tier];
 			let statName: StatID;
-			for (statName of Stats.statIDsExceptHP) {
+			for (statName in pokemon.baseStats as StatsTable) {
+				if (statName === 'hp') continue;
 				pokemon.baseStats[statName] = this.clampIntRange(pokemon.baseStats[statName] + boost, 1, 255);
 				pokemon.bst += pokemon.baseStats[statName];
 			}
diff --git a/lib/utils.ts b/lib/utils.ts
index c46b985a91..b117ede0c2 100644
--- a/lib/utils.ts
+++ b/lib/utils.ts
@@ -153,6 +153,7 @@ export function visualize(value: any, depth = 0): string {
 
 /**
  * Compares two variables; intended to be used as a smarter comparator.
+ * The two variables must be the same type (TypeScript will not check this).
  *
  * - Numbers are sorted low-to-high, use `-val` to reverse
  * - Strings are sorted A to Z case-semi-insensitively, use `{reverse: val}` to reverse
@@ -161,7 +162,7 @@ export function visualize(value: any, depth = 0): string {
  *
  * In other words: `[num, str]` will be sorted A to Z, `[num, {reverse: str}]` will be sorted Z to A.
  */
-export function compare<T extends Comparable>(a: T, b: T): number {
+export function compare(a: Comparable, b: Comparable): number {
 	if (typeof a === 'number') {
 		return a - (b as number);
 	}
@@ -179,7 +180,7 @@ export function compare<T extends Comparable>(a: T, b: T): number {
 		return 0;
 	}
 	if ('reverse' in a) {
-		return compare((b as {reverse: Comparable}).reverse, a.reverse);
+		return compare((b as {reverse: string}).reverse, a.reverse);
 	}
 	throw new Error(`Passed value ${a} is not comparable`);
 }
@@ -317,12 +318,12 @@ export function clearRequireCache(options: {exclude?: string[]} = {}) {
 	}
 }
 
-export function deepClone<T>(obj: T): Mutable<T> {
+export function deepClone(obj: any): any {
 	if (obj === null || typeof obj !== 'object') return obj;
-	if (Array.isArray(obj)) return obj.map(prop => deepClone(prop)) as T;
+	if (Array.isArray(obj)) return obj.map(prop => deepClone(prop));
 	const clone = Object.create(Object.getPrototypeOf(obj));
 	for (const key of Object.keys(obj)) {
-		clone[key] = deepClone(obj[key as keyof typeof obj]);
+		clone[key] = deepClone(obj[key]);
 	}
 	return clone;
 }
diff --git a/server/chat-plugins/datasearch.ts b/server/chat-plugins/datasearch.ts
index 4fb104fea5..76e0fc90b0 100644
--- a/server/chat-plugins/datasearch.ts
+++ b/server/chat-plugins/datasearch.ts
@@ -1613,7 +1613,7 @@ function runMovesearch(target: string, cmd: string, canAll: boolean, message: st
 
 	const getFullLearnsetOfPokemon = (species: Species) => {
 		let usedSpecies: Species = Utils.deepClone(species);
-		let usedSpeciesLearnset: LearnsetData | undefined = Utils.deepClone(mod.species.getLearnset(usedSpecies.id));
+		let usedSpeciesLearnset: LearnsetData = Utils.deepClone(mod.species.getLearnset(usedSpecies.id));
 		if (!usedSpeciesLearnset) {
 			usedSpecies = Utils.deepClone(mod.species.get(usedSpecies.baseSpecies));
 			usedSpeciesLearnset = Utils.deepClone(mod.species.getLearnset(usedSpecies.id) || {});
diff --git a/server/chat-plugins/othermetas.ts b/server/chat-plugins/othermetas.ts
index fbeab04791..fc40f6ac58 100644
--- a/server/chat-plugins/othermetas.ts
+++ b/server/chat-plugins/othermetas.ts
@@ -311,7 +311,7 @@ export const commands: Chat.ChatCommands = {
 		}
 		const bst = species.bst;
 		species.bst = 0;
-		for (const i of Stats.statIDs) {
+		for (const i in species.baseStats) {
 			if (dex.gen === 1 && i === 'spd') continue;
 			species.baseStats[i] = species.baseStats[i] * (bst <= 350 ? 2 : 1);
 			species.bst += species.baseStats[i];
@@ -362,11 +362,12 @@ export const commands: Chat.ChatCommands = {
 			LC: 40,
 		};
 		let tier = species.tier;
-		if (tier.startsWith("(")) tier = tier.slice(1, -1) as TierTypes.Singles | TierTypes.Other;
+		if (tier[0] === '(') tier = tier.slice(1, -1);
 		if (!(tier in boosts)) return this.sendReply(`|html|${Chat.getDataPokemonHTML(species, dex.gen)}`);
 		const boost = boosts[tier as TierShiftTiers];
 		species.bst = species.baseStats.hp;
-		for (const statName of Stats.statIDsExceptHP) {
+		for (const statName in species.baseStats) {
+			if (statName === 'hp') continue;
 			if (dex.gen === 1 && statName === 'spd') continue;
 			species.baseStats[statName] = Utils.clampIntRange(species.baseStats[statName] + boost, 1, 255);
 			species.bst += species.baseStats[statName];
@@ -409,7 +410,7 @@ export const commands: Chat.ChatCommands = {
 		const bstNoHP = species.bst - species.baseStats.hp;
 		const scale = (dex.gen !== 1 ? 600 : 500) - species.baseStats['hp'];
 		species.bst = 0;
-		for (const stat of Stats.statIDs) {
+		for (const stat in species.baseStats) {
 			if (stat === 'hp') continue;
 			if (dex.gen === 1 && stat === 'spd') continue;
 			species.baseStats[stat] = Utils.clampIntRange(species.baseStats[stat] * scale / bstNoHP, 1, 255);
@@ -461,7 +462,7 @@ export const commands: Chat.ChatCommands = {
 				spd: species.baseStats.atk,
 				spe: species.baseStats.hp,
 			};
-			for (const stat of Stats.statIDs) {
+			for (const stat in species.baseStats) {
 				species.baseStats[stat] = flippedStats[stat];
 			}
 			this.sendReply(`|raw|${Chat.getDataPokemonHTML(species, dex.gen)}`);
@@ -469,7 +470,7 @@ export const commands: Chat.ChatCommands = {
 		}
 		const stats = Object.values(species.baseStats).reverse();
 		for (const [i, statName] of Object.keys(species.baseStats).entries()) {
-			species.baseStats[statName as keyof typeof species.baseStats] = stats[i];
+			species.baseStats[statName] = stats[i];
 		}
 		this.sendReply(`|raw|${Chat.getDataPokemonHTML(species, dex.gen)}`);
 	},
@@ -590,7 +591,7 @@ export const commands: Chat.ChatCommands = {
 		} else if (mixedSpecies.weighthg >= 100) {
 			weighthit = 40;
 		}
-		const details: {[k: string]: string | number} = {
+		const details: {[k: string]: string} = {
 			"Dex#": mixedSpecies.num,
 			Gen: mixedSpecies.gen,
 			Height: mixedSpecies.heightm + " m",
@@ -636,6 +637,8 @@ export const commands: Chat.ChatCommands = {
 				deltas.types = deltas.types.filter((type: string | undefined) => type !== undefined);
 
 				if (deltas.types[0] === deltas.types[1]) deltas.types = [deltas.types[0]];
+			} else {
+				deltas.types = null;
 			}
 		}
 		deltas.bst = 0;
diff --git a/sim/dex.ts b/sim/dex.ts
index 6e1fbb8d14..6fa39035c4 100644
--- a/sim/dex.ts
+++ b/sim/dex.ts
@@ -310,7 +310,7 @@ export class ModdedDex {
 	getActiveMove(move: Move | string): ActiveMove {
 		if (move && typeof (move as ActiveMove).hit === 'number') return move as ActiveMove;
 		move = this.moves.get(move);
-		const moveCopy = this.deepClone(move) as ActiveMove;
+		const moveCopy: ActiveMove = this.deepClone(move);
 		moveCopy.hit = 0;
 		return moveCopy;
 	}
diff --git a/sim/global-types.ts b/sim/global-types.ts
index e08145bdbf..820d598db0 100644
--- a/sim/global-types.ts
+++ b/sim/global-types.ts
@@ -24,14 +24,8 @@ type PokemonSlot = '' | string & {__isSlot: true};
 interface AnyObject {[k: string]: any}
 
 type GenderName = 'M' | 'F' | 'N' | '';
-const _statIDsExceptHP = ['atk', 'def', 'spa', 'spd', 'spe'] as const;
-const _statIDs = [..._statIDsExceptHP, 'hp'] as const;
-namespace Stats {
-	export const statIDsExceptHP = _statIDsExceptHP;
-	export const statIDs = _statIDs;
-}
-type StatIDExceptHP = typeof _statIDsExceptHP[number];
-type StatID = typeof _statIDs[number];
+type StatIDExceptHP = 'atk' | 'def' | 'spa' | 'spd' | 'spe';
+type StatID = 'hp' | StatIDExceptHP;
 type StatsExceptHPTable = {[stat in StatIDExceptHP]: number};
 type StatsTable = {[stat in StatID]: number};
 type SparseStatsTable = Partial<StatsTable>;
@@ -70,7 +64,7 @@ namespace TierTypes {
 	export type Singles = "AG" | "Uber" | "(Uber)" | "OU" | "(OU)" | "UUBL" | "UU" | "RUBL" | "RU" | "NUBL" | "NU" |
 	"(NU)" | "PUBL" | "PU" | "(PU)" | "NFE" | "LC";
 	export type Doubles = "DUber" | "(DUber)" | "DOU" | "(DOU)" | "DBL" | "DUU" | "(DUU)" | "NFE" | "LC";
-	export type Other = "Unreleased" | "Illegal" | "CAP" | "CAP NFE" | "CAP LC" | "MnM" | "NS" | "CE";
+	export type Other = "Unreleased" | "Illegal" | "CAP" | "CAP NFE" | "CAP LC";
 }
 
 interface EventInfo {