2.9 TLS session cache doesn't work with TFO
2.10 Store TLS context per transfer instead of per connection
2.11 Schannel TLS 1.2 handshake bug in old Windows versions
+ 2.12 FTPS with Schannel times out file list operation
3. Email protocols
3.1 IMAP SEARCH ALL truncated response
https://github.com/curl/curl/issues/5488
+2.12 FTPS with Schannel times out file list operation
+
+ "Instead of the command completing, it just sits there until the timeout
+ expires." - the same command line seems to work with other TLS backends and
+ other operating systems. See https://github.com/curl/curl/issues/5284.
+
3. Email protocols
3.1 IMAP SEARCH ALL truncated response