Summary

When appending a bson document to a bsoncxx builder

valgrind reports a memory leak.

Environment

driver version: latest monogc latest mongocxx.

ubuntu 64 bit.

valgrind output:

==2064== 12,288 bytes in 10 blocks are definitely lost in loss record 618 of 620
==2064==    at 0x4C2DB4F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2064==    by 0x99536E: bson_malloc (bson-memory.c:66)
==2064==    by 0x985A98: _bson_impl_inline_grow (bson.c:128)
==2064==    by 0x985A98: _bson_grow (bson.c:219)
==2064==    by 0x986E03: _bson_append_va (bson.c:326)
==2064==    by 0x986E03: _bson_append (bson.c:412)
==2064==    by 0x9880F3: bson_append_document (bson.c:1147)
==2064==    by 0x977353: bsoncxx::v_noabi::builder::core::append(bsoncxx::v_noabi::types::b_document const&) 
==2064==    by 0x97A028: bsoncxx::v_noabi::builder::core::append(bsoncxx::v_noabi::document::view)

How to Reproduce

1. have a bsoncxx::document::value  with data
2. append the document from step 1 to a builder