Wrong operator associativity or precedence

[qraynaud]

• I'm submitting a bug report

• Library Version:
  1.4.1

• Operating System:
  Linux (KUbuntu 14.10)

• Node Version:
  10.4.1

• NPM Version:
  6.1.0

• JSPM OR Webpack AND Version
  Neither, I'm using my own build system

• Browser:
  all

• Language:
  all

• Current and expected behavior:
  I don't know which one is wrong, but either / or * has the wrong associativity (they should have a left one). Or maybe * has precedence over / while they should have the same precedence!

Eg, 4/2*10 is equal to 20 since it is equivalent to (4/2)*10 but I get 0.2.

There is the same kind of error with 4-2+10 that should be equal to 12 but is reported as -8 by aurelia.

It took me a very long time to understand this was not a mistake on my side ^^.

Here is a gist reproducing this: https://gist.run/?id=86a169dd2dea36afc86745cbe781d4dd

• What is the motivation / use case for changing the behavior?
  Mathematical expressions have a very strong operator precedence/associativity acceptance. Everyone was taught those during school. I think it would be a very bad design decision to think this is a design choice.

Plus I think this is a regression because the expression looking like this in my code worked for some time.

[qraynaud]

I think this bug should have been in aurelia-binding instead.

I think this is likely bug aurelia/binding/issues/586.

I'm closing this myself!