Description:
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In UPGRADING there's this:
"
- PDO MySQL:
  . Integers and floats in result sets will now be returned using native PHP
    types instead of strings when using emulated prepared statements. This
    matches the behavior of native prepared statements. You can restore the
    previous behavior by enabling the PDO::ATTR_STRINGIFY_FETCHES option.
"

In my code I don't use prepare()/execute(), nor PDO::ATTR_EMULATE_PREPARES. All I use is query()/fetch(). However, I noticed that I started getting integers instead of strings now.

So, is that a bug? Maybe query() uses prepared queries internally. But then maybe it should be clarified, that it has really nothing to do with prepared statements mode.