:sig
StringMap memcache_get_multiple(u64 connection, StringList keys)

:params
connection : connection handle
keys : a list of strings containing the keys to be retrieved
return value : a StringMap with the retrieved entries

:see
>memcache

:content
Retrieves multiple entries in one call.

The result is returned as a `StringMap` keyed by the requested Memcache keys.

:example
print("memcache_get_multiple is resource-bound; configure the service or connection, then call it in request code.\n");