sap.m.Select: Keystroke indexing in list doesn't work with Chinese IME

OpenUI5 version: latest

Browser/version (+device/version): all

Any other tested browsers/devices(OK/FAIL):

URL (minimal example if possible):
https://openui5.hana.ondemand.com/explored.html#/sample/sap.m.sample.Select/preview
https://jsbin.com/lupini/edit?html,js,output

User/password (if required and possible - do not post any confidential information here):

Steps to reproduce the problem:

1. Bring up the jsbin sample and give focus to the Select control
2. Activate any Chinese IME
3. Attempt to compose a Chinese character using the IME, such as the first one in the Select control's list ( '可')

What is the expected result? Expected that keystrokes would activate the IME composition window in order to allow for composing of a Chinese character, to assist in navigating through the Select list, similar to the behavior of single-byte characters.

What happens instead? When the list contains only Chinese characters, keystrokes are ignored since any single key doesn't match the multi-byte Chinese characters.

Any other information? (attach screenshot if possible) This may be by design, but it's a loss in functionality for Asian locales, as the user doesn't have the same convenience of searching through a long list by specifying the first character.