Note: Here's my version of translation without any permission nor consent of an original author. This is done just for my English training. But I'm happy if this is a good source to know what's going on in Japanese community.
In his blog (http://www.rubyist.net/~matz/20080125.html), Matz, the creator of Ruby, objected to the on-line article that explained about PHP's string processing. Matz quoted the author's view:
"One of the current topics is we'll be in trouble when we use both binary-safe and binary-unsafe functions at a time (http://www.atmarkit.co.jp/fsecurity/rensai/httpbasic04/httpbasic03.html)."
and argued that the existence of these two kinds of functions itself was unacceptable. Matz even thought this should be an architectural flaw.
Although Matz admitted the necessity of C-string, he asserted that string processing functions must be independent of the factor binary-safe or not. For example, a null character is never fit in a file path; therefore, runtime should raise an error when a null character is detected while examination is going on.
As he wrote in his blog, Matz regarded it as a bug when imperfect examination failed to find null string in a wrong place. He insisted Ruby has his idea now.