Completion not filtering/sorting by prefix #630

Hello! I'm working on a tool which uses javascript-typescript-langserver among other LSPs.

Diagnostics work fine, but I'm having trouble (or am I?) with the way completion works. Consider the example:

1. I invoke completion (| is the position of the cursor I send with CompletionParams.Position):

document.body.|textContent = user; 

and get all kinds of relevant stuff, starting with accessKey, and including the textContent.

2. Now I invoke the completion here:

document.body.tex|tContent = user; 

and I get the very same result, not filtered or sorted by the tex prefix.

Is it an expected behaviour? Is it LSP client's job to sort/filter the completion suggestions? Thank you!

Btw, theia-ide/typescript-language-server/ displays the same behaviour.