Even though I'm not a fan of using auto wherever possible, these uses of auto
are okay. Unfortunately the commit also contains format changes that I don't like.

Curly brackets shall be on lines by themselves when they delimit a block of statements.

if (...)
{
  ...
}
else
{
  ...
}

instead of

if (...) {
  ...
} else {
  ...
}

The asterisk that denotes a pointer goes with the type name, not with the variable name.
int* pi instead of int *pi. More relevant to your commit: static_cast<std::istream*>(context)
instead of static_cast<std::istream *>(context).
You may or may not like these formatting rules. No one likes all rules, but the
formatting shall be consistent in code that many people change.

Fixed.

The previous formatting was done by clang-format.

The previous formatting was done by clang-format.

clang-format formats as you request it to format. The result can be controlled
with a .clang-format configuration file.