USDT and decimals

import { createPublicClient, erc20Abi, formatUnits, http, parseUnits } from "viem";
import { botChainTestnet } from "@uzolabs/sdk/chains";
import { getAddresses } from "@uzolabs/sdk/contracts";

const client = createPublicClient({ chain: botChainTestnet, transport: http() });
const { usdt } = getAddresses(botChainTestnet.id);

// Read decimals from the contract instead of assuming 18.
const decimals = await client.readContract({ address: usdt, abi: erc20Abi, functionName: "decimals" });
console.log(`USDT decimals: ${decimals}`);

// Human amount to base units, for contract calls.
const amount = parseUnits("12.5", decimals);
console.log(`12.5 USDT = ${amount} base units`);

// Base units to a human amount, for display.
const balance = await client.readContract({ address: usdt, abi: erc20Abi, functionName: "balanceOf", args: ["0xEc526474F4F9De027942d5f7118A9613266B0C4c"] });
console.log(`Balance: ${formatUnits(balance, decimals)} USDT (${balance} base units)`);

// The bug: treating USDT like an 18-decimal token.
console.log(`Wrong: parseUnits("12.5", 18) = ${parseUnits("12.5", 18)}, which is ${formatUnits(parseUnits("12.5", 18), decimals)} USDT`);