xiaomi_miio vacuum fan speed

[mat4444]

The problem

According to the Xiaomi Mi Robot Vacuum documentation, the only fan speeds options are: Silent, Standard, Medium, Turbo and Gentle (exclusively for mopping).
I own a Xiaomi Mi Robot Vacuum V1 and while I don't remember having issues previously, after upgrading to FW 3.5.8_004018, these options are not understood anymore by my vacuum. Every other services work well with my vacuum. The only issue is setting the fan speed.
There is no issue in the logs.

Environment

Raspberry Pi 3B+
arch | armv7l
chassis | embedded
dev | false
docker | true
docker_version | 19.03.11
hassio | true
host_os | HassOS 4.15
installation_type | Home Assistant OS
os_name | Linux
os_version | 4.19.127-v7
python_version | 3.8.6
supervisor | 2020.11.0
version | 0.117.5
virtualenv | false

Problem-relevant configuration.yaml

I am quite sure the configuration is correct. Everything except the fan speed works well.

vacuum:
  - platform: xiaomi_miio
    name: Aspirateur Xiaomi
    host: 192.168.0.22
    token: !secret xiaomi_vacuum_robot_token

Traceback/Error logs

No error reported

Additional information

With this vacuum reference and FW version, the speed fan are reported as INT values. Therefore, the speed fan can be set using INT values:
Silent --> 38
Standard --> 60
Medium --> 75
Turbo --> 100
Gentle --> Not an option for this vacuum
However, with this 'bug', it's impossible to use the built-in fan speed dropdown list (the one shown in the screenshot below).
I suppose there is no conversion between the 'text' option and the 'number' options

[probot-home-assistant]

Hey there @rytilahti, @syssi, @starkillerOG, mind taking a look at this issue as its been labeled with an integration (xiaomi_miio) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[rytilahti]

This needs to be fixed upstream, so please open an issue at python-miio repository (https://github.com/rytilahti/python-miio/), the code that requires to be adapted is here: https://github.com/rytilahti/python-miio/blob/master/miio/vacuum.py#L482

[github-actions]

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