ExWeb3 / elixir_ethers / 0eb66360ff186e498b3eeabbb211f1fd8deaeb0e-PR-144

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Pull #144

github

Support optional fields in EventFilter typespecs

The current typespec generator emits a dialyzer warning when nil values are set for the indexed topics of an `EventFilter`:

```elixir
The function call will not succeed.

Ethers.Contracts.ERC20.EventFilters.transfer(nil, nil)

breaks the contract
(Ethers.Types.t_address(), Ethers.Types.t_address()) :: Ethers.EventFilter.t()
```

This can be fixed by making the arguments nullable for events.

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