The conversion rate assumes the value token and the brand token have the same decimals, but we don't explicitly require this in the constructor.
Note, eg. OST has decimals 18, USD coin 6, and gemini dollar 2; by requiring the decimals to match explicitly the conversion rate is more clear and cannot be misused to accommodate for different decimals between value token and Brand Token
The conversion rate assumes the value token and the brand token have the same decimals, but we don't explicitly require this in the constructor.
Note, eg. OST has decimals 18, USD coin 6, and gemini dollar 2; by requiring the decimals to match explicitly the conversion rate is more clear and cannot be misused to accommodate for different decimals between value token and Brand Token