Zlib::GzipReader#pos underflows after calling #ungetbyte or #ungetc at start of file [Bug #13616]
patched by Andrew Haines <andrew@haines.org.nz> [ruby-core:81488]
zlib.c: fix unnormalized Fixnum
* ext/zlib/zlib.c (rb_gzfile_total_out): cast to long not to
result in an unsigned long to normalized to Fixnum on LLP64
platforms. [ruby-core:81488]
merge revision(s) 59333,59337: [Backport #13616]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59532 b2dd03c8-39d4-4d8f-98ff-823fe69b080e