Solidity: Premint amounts below 1 with a leading fractional zero generate code that does not compile #893

1. In the Solidity ERC20 tab, set Premint to 0.05.
2. Compile the generated contract.

Or with the package:

const { erc20 } = require('@openzeppelin/wizard');
console.log(erc20.print({ name: 'MyToken', symbol: 'MTK', premint: '0.05' }));

Actual behavior

The constructor contains:

_mint(recipient, 05 * 10 ** (decimals() - 2));

solc fails with:

ParserError: Octal numbers not allowed.

The same happens for other amounts such as 0.001 or 0.001e1, and for Stablecoin, RWA, and Confidential ERC7984, which share calculatePremint.

Expected behavior

The generated line is _mint(recipient, 5 * 10 ** (decimals() - 2));, which compiles.

Cause

calculatePremint in packages/core/solidity/src/erc20.ts strips leading zeros from the integer part and trailing zeros from the fractional part, then concatenates them. Leading zeros of the fractional part remain at the start of units when the integer part is empty.