Mixins and redefined variables

Hello! Thank you guys for such a great tool!

I'm using it for awhile and I think, in the previous version such code snippet:

@variable: #fff;

.fav-color(@color: @variable) {
    color: @color;
}

.message {
    @variable: #f00;

    .fav-color();
}

would be compiled into:

.message {
  color: #ff0000;
}

And with the last month update the behaviour was changed and now it compiles to:

.message {
  color: #ffffff;
}

I understand, that the second result may look more logical, but curious if there is a spec for that or it is up to implementator to decide and both results are valid?

Not a spec as such, but we directly use the Less javascript source from http://lesscss.org/ so if there has been a change in functionality it will probably be noted somewhere on here: https://github.com/cloudhead/less.js/blob/master/CHANGELOG.md although nothing is jumping out as matching this. The other place to have a hunt would be on the Github issues list for Less.

Jeremy