How to get rid of stripes on canvas when using scale() ?

Question

JavaScript

In chrome (and not only), if you increase the frame on canvas using scale(), stripes appear.
Stripes form at the junction of tiles
jsbin.com/nixezuda/6/watch?js,output
How to remove them?

Answer 1

Draw tiles per pixel right-down more so that they overlap,
draw as you drew with the old size using delta +1/s
like here jsfiddle.net/W9LpB