Bug 8890 – std.algorithm.commonPrefix does not handle unicode correctly

This code asserts: import std.algorithm; void main() { assert(commonPrefix("Пиво", "Пони")== "П"); } This is because a portion of the code point following 'П' is returned, because the code units at the beginning of the next code point match, and commonPrefix fails to take that possibility into account. It basically operates on code units right now for matching string types rather than operating on code points as it should.

Commits pushed to master at https://github.com/D-Programming-Language/phobos https://github.com/D-Programming-Language/phobos/commit/dd5eb5ff97736ecaec525488413382f94c0053ea Fix for issue# 8890: commonPrefix does not handle unicode correctly. It was returning partial code points if the first few code units in a code point matched but not the entire code point. https://github.com/D-Programming-Language/phobos/commit/2aa1295f4d1b884713e7465b4c1f48d926d936b3 Merge pull request #889 from jmdavis/8890 Fix for issue# 8890: commonPrefix does not handle unicode correctly.

*** Issue 8754 has been marked as a duplicate of this issue. ***