I have a question about the scoping of "myVar" here:

# CoffeeScript:
foo myVar = 1
.bar -> myVar = 2

# Generates this Javascript:
var myVar;
foo(myVar = 1).bar(function() {
  var myVar;
  return myVar = 2;
});

In the example above, myVar gets scoped in two places, but if we remove the dot (.), it's only scoped in the enclosing scope:

# CoffeeScript:
foo myVar = 1
bar -> myVar = 2

# Generates this Javascript:
var myVar;
foo(myVar = 1);
bar(function() {
  return myVar = 2;
});

My understanding of CoffeeScript scoping is: if the variable is assigned in the enclosing scope lexically-before it is used in a function sub-scope, the sub-scope will use that binding. The first case above breaks this rule. Is this a bug? Or am I not understanding CoffeeScript scoping fully?