ExWeb3 / elixir_ethers / ca265053691d6f7f84a662c4141036e1f03cd676

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Support optional fields in EventFilter typespecs (#144)

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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