Testing script: ```python import socket print( socket.getaddrinfo( '127.0.0.1', 80, type=socket.SOCK_STREAM, )[0][3], # ai_canonname socket.getaddrinfo( '127.0.0.1', 80, type=socket.SOCK_STREAM, flags=socket.AI_CANONNAME, )[0][3], # ai_canonname ) ``` Testing result: | Platform | flags=AI_CANONNAME | flags=0 | |-------------|--------------------|---------------| | Linux glibc | `"127.0.0.1"` | `""` | | Linux musl | `"127.0.0.1"` | `"127.0.0.1"` | | macOS | `""` | `""` | | uvloop | `""` | `""` | ~Expected result: uvloop `__static_getaddrinfo_pyaddr()` returns consistent result as the platform std C lib returns.~ UPDATE: we would expect `__static_getaddrinfo_pyaddr()` honor the AI_CANONNAME flag.