F# array ligature characters unrecognizable

[valler]

Now, I love ligatures, but is there any reason why the [| and |] ligatures have no resemblance of a vertical bar and a square bracket? This thing practically renders as a box, which is very confusing. It looks as if the font is missing a glyph. My guess is that even the slightest vertical extent of the bar below and above the bracket would help a lot in terms of readability, just like in the non-ligature variant it requires only very little space between the glyphs to read them as what they are.

[tonsky]

Yeah, maybe not a good idea to turn it into a box