* range.c: Fix Range#bsearch for floats [Bug #7724]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38978 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* object.c: Improve error for failed implicit conversions [Bug #7539]

* error.c: Adapt rdoc

* test/ruby/test_object.rb: Test for above

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e