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Ethereum smart contract fuzzer

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### Describe the issue: While trying to deploy an ERC1967Proxy echidna fails with error: `error UnrecognizedOpcode 94` ### Code example to reproduce the issue: ```solidity import { ERC1967Proxy } from...

### Describe the issue: Fallback function given certain parameters can break the property to test. ### Code example to reproduce the issue: ```solidity contract Example { mapping(address => uint) public...

Currently you have to finish the run (`testLimit`). I normally have this set to a huge number and always close Echidna manually.

usability

### Describe the issue: I'm shrinking about 10 optimization functions with seqLen 250 and 16 workers. Once all the workers are stopped, 1 shrink iteration is performed and then after...

bug
shrinking

### Describe the desired feature Disabling slither speeds up the startup time considerably. It would be useful to have an option to disable slither during development of the fuzzing suite.

enhancement

This makes `--test-limit 0` run indefinitely, in line with medusa's behavior.