==614897== Invalid read of size 1
==614897==    at 0x484F234: strlen (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==614897==    by 0x485B74A: XS_Simple__Ngram_uppercase_utf8_2 (Ngram.xs:79)
==614897==    by 0x2441A9: ??? (in /usr/bin/perl)
==614897==    by 0x2396DD: Perl_runops_standard (in /usr/bin/perl)
==614897==    by 0x1781DA: perl_run (in /usr/bin/perl)
==614897==    by 0x14D639: main (in /usr/bin/perl)
==614897==  Address 0x5bb9282 is 0 bytes after a block of size 18 alloc'd
==614897==    at 0x484DB80: realloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==614897==    by 0x55AEF01: libunistring_u8_casemap (in /usr/lib/x86_64-linux-gnu/libunistring.so.5.0.0)
==614897==    by 0x55AF478: u8_toupper (in /usr/lib/x86_64-linux-gnu/libunistring.so.5.0.0)
==614897==    by 0x485B73F: XS_Simple__Ngram_uppercase_utf8_2 (Ngram.xs:78)
==614897==    by 0x2441A9: ??? (in /usr/bin/perl)
==614897==    by 0x2396DD: Perl_runops_standard (in /usr/bin/perl)
==614897==    by 0x1781DA: perl_run (in /usr/bin/perl)
==614897==    by 0x14D639: main (in /usr/bin/perl)
==614897== 
==614897== 
==614897== HEAP SUMMARY:
==614897==     in use at exit: 2,544,437 bytes in 9,481 blocks
==614897==   total heap usage: 33,789 allocs, 24,308 frees, 6,454,177 bytes allocated
==614897== 
==614897== 2 bytes in 1 blocks are possibly lost in loss record 1 of 1,342
==614897==    at 0x4846828: malloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==614897==    by 0x24EADB: Perl_sv_magicext (in /usr/bin/perl)
==614897==    by 0x24ED0A: Perl_sv_magic (in /usr/bin/perl)
==614897==    by 0x183F8C: Perl_gv_fetchpvn_flags (in /usr/bin/perl)
==614897==    by 0x174ED2: perl_parse (in /usr/bin/perl)
==614897==    by 0x14D55B: main (in /usr/bin/perl)