:sig
String memcache_command(u64 connection, String command)

:params
connection : connection handle
command : string containing the Memcache command
return value : string containing the Memcache server's response

:see
>memcache

:content
Executes a raw command on an open Memcache connection and returns the server response as a string.

This is the low-level escape hatch for Memcache operations that are not covered by the dedicated helpers.
UCE reads the complete framed ASCII response, including multi-value retrievals and `stats`, rather than returning a socket chunk. The complete write and read share a one-second deadline and responses are limited to 8 MiB. A timeout, malformed frame, or oversized response returns an empty string and makes that connection unusable so unread bytes cannot affect a later command. Commands ending in `noreply` and `quit` return immediately with an empty string.

:example
u64 conn = memcache_connect();
if(conn != 0) print(memcache_command(conn, "stats") != "" ? "stats command returned data" : "no data", "\n");
else print("(requires a reachable memcached server)\n");