I really appreciate everybody's opinion here, really do. I've try other languages and they all have the same behaviour:

Smalltalk:

(0.6 / 0.2) asInteger
2
[download]

Python:

python -c 'print int(0.6/0.2)'
2
[download]

Ruby:

ruby -e 'print (0.6/0.2).to_i'
2
[download]

In the end I believe Dynamic languages ( perl, ruby, python ) should handle cases like this in a more elegant and seamless way.

Dynamic languages do a pretty job hiding the internal representation of numbers for the user, in the sense that you can create program without knowing whether a variable holds an integer, double, float, fixed precision or any other representation. We leave the details of picking the right representation to the compiler/interpreter, so we (users) could expect to handle such border cases also seamlessly.

As a final though,

• do you think that everybody would easily spot why int(0.6/0.2) returns 2 instead of 3 ?
• If print 3.0 returned 2.99999999 would you tell users that interpreter is doing the right job and users should stay away of using number with decimal places?