Question about metadata.js for extensions

[shuihuzhuan free fr]

Hello,

I've written a small extension for 3.2. For 3.4, nothing has changed. Can I simply write 
in metadata.js :

{
"shell-version": ["3.2", "3.4"], 
"uuid": ...

and upload the update to extensions.gnome.org, disable the previous version, and it will work 
for both 3.2 and 3.4? 

Or may I need to write :

{
"shell-version": ["3.4"], 
"uuid": ...

and keep both versions on the site?

Thanks for your answer on that small tip.