opened
BobLd
username_0
The [following document](https://statweb.stanford.edu/~jbien/jasa2011minimax.pdf) contains several [control characters](https://www.compart.com/en/unicode/category/Cc). For example, the page 8 contains _\u0002, \u0003, \b, \u0005, \u0006, \a, \t, \n, \v, \f_.
The problem with some of the control chars listed above is that their bounding boxes create issues with `words`, `lines` and `textblocks`. 
I guess they should be removed from the page's letters (appart from the `backspace`, see below).

The [`backspace` character](https://en.wikipedia.org/wiki/Backspace#cite_ref-2) (_\b_) is used in this page to [overstrike](https://en.wikipedia.org/wiki/Overstrike) the `=` sign and transform it into an `≠` (equal sign with a strikethrough). This `backspace` behaviore should be handled to return the correct character.
Handling control characters and overstrike with backspace
issue