Exec doesn't time out when passing stdin

[aramgre]

container = Docker::Container.create(Image: 'debian:latest', Cmd: ['sleep', 'infinity'])
container.start
container.exec(['sleep', 'infinity'], wait: 5)
# Docker::Error::TimeoutError (read timeout reached)

container.exec(['sleep', 'infinity'], wait: 5, stdin: StringIO.new('hello'))
# hangs

container.exec(['bash', '-c', 'cat; sleep infinity'], wait: 5, stdin: StringIO.new('hello'))
# hangs

Hijacking the Excon socket instead of the underlying socket gets the timeout to work again but I don't know if that would break anything else:

diff --git a/lib/docker/util.rb b/lib/docker/util.rb
index 2ca8dc6..432f26e 100644
--- a/lib/docker/util.rb
+++ b/lib/docker/util.rb
@@ -65,10 +65,10 @@ module Docker::Util
       debug "hijack: starting stdin copy thread"
       threads << Thread.start do
         debug "hijack: copying stdin => socket"
-        IO.copy_stream stdin, socket
+        socket.write stdin.read
 
         debug "hijack: closing write end of hijacked socket"
-        close_write(socket)
+        close_write(socket.instance_variable_get(:@socket))
       end
 
       debug "hijack: starting hijacked socket read thread"
@@ -76,7 +76,7 @@ module Docker::Util
         debug "hijack: reading from hijacked socket"
 
         begin
-          while chunk = socket.readpartial(512)
+          while chunk = socket.read(512)
             debug "hijack: got #{chunk.bytesize} bytes from hijacked socket"
             attach_block.call chunk, nil, nil
           end
diff --git a/lib/excon/middlewares/hijack.rb b/lib/excon/middlewares/hijack.rb
index 727cf29..b2b731c 100644
--- a/lib/excon/middlewares/hijack.rb
+++ b/lib/excon/middlewares/hijack.rb
@@ -39,7 +39,7 @@ module Excon
           datum[:response] = build_response(status, socket)
 
           Excon::Response.parse_headers(socket, datum)
-          datum[:hijack_block].call socket.instance_variable_get(:@socket)
+          datum[:hijack_block].call(socket)
         end
 
         @stack.response_call(datum)
~