A delegation pool holds tokens deposited by delegators as well as rewards. When rewards start accruing, delegating a very-very small amount of new tokens by a delegator could lead to zero shares being assigned even if the tokens deposited were accepted.
Specification
Revert in any condition when no shares are assigned by adding a check in the delegate() function right after the amount of shares is calculated for the amount of tokens received.
Implementation
See @graphprotocol/contracts#491
Backwards Compatibility
The proposal is fully backwards compatible.
Validation
Audits
The implementation was audited by Consensys Diligence.
Testnet
The implementation has not yet been deployed to Testnet.