Submitted by hansfriese
The raw rewardsPerSecond might be too big for some ERC20 tokens and it wouldnt work as intended.
As we can see from _accrueStatic(), the rewardsPerSecond is a raw amount without any multiplier.
But 1 wei for 1 second would be too big an amount for some popular tokens like WBTC(8 decimals) and EURS(2 decimals).
For WBTC, it will be 0.31536 WBTC per year (worth about $7,200) to meet this requirement, and for EURS, it must be at least 315,360 EURS per year (worth about $315,000).
Such amounts might be too big as rewards and the protocol wouldnt work properly for such tokens.
Recommend introducing a RATE_DECIMALS_MULTIPLIER = 10**9(example) to increase the precision of rewardsPerSecond instead of using the raw amount.
RedVeil (Popcorn) confirmed 
