Protect part of text from external formatting

I would like to create a macro ProtectedBold
such that

foo textit{ProtectedBold{bar}}

would compile as "foo bar" and not "foo bar".

What is the standard way to achieve this?

documentclass{article}
newcommandProtectedBold[1]{textup{textbf{#1}}}
begin{document}
foo textit{ProtectedBold{bar}}
end{document}