Use Case

As a BSON library user, 
I want -0 to serialize to the Double type
So that it remains negative when round-trips from BSON. 

User Impact

*How severe is the impact? Is anyone blocked or broken?

Users who use -0 are not able to preserve the negative.

Dependencies

• JS-BSON, BSON-EXT

Unknowns

• Is it a breaking change to start serializing -0 differently?
• How does BSON-EXT serialize -0?

Acceptance Criteria

• TBD, based on unknowns

Implementation Requirements

• to have bson.serialize(-0) to Double (BSON type 0x01)

Testing Requirements

• see js-bson/test/node/double_tests.js for skipped test __