The project uses multiple compiler versions with most specifying ^0.8.0, some specifying >=0.8.0, which allows breaking versions >= 0.9.0 in the future if reused/redeployed, and some even allowing much older >= 0.5.0/0.6.0.
The dangers of allowing multiple compilers across breaking revisions are that the security bug fixes and features might differ across different contracts introducing vulnerabilities or giving a false sense of security.
For example, most contracts use ^0.8.0, which means they have default-checked arithmetic to prevent overflows/underflows without using OZ SafeMath. This doesnt apply to the few (inherited) contracts that may be compiled with <0.8.0 and have unchecked overflows/underflows.
Recommend:
alberocuestacanada (Yield) confirmed
