The goLang decimal type saves the mongoDB database

[ApengGithub]

I import decimal third-party packages(url:github.com/shopspring/decimal), in the field to an entity defines the amount of decimal. The decimal type (chart 1), save the amount fields to mongo database when no value (chart 2), Can authors write a bson type map in decimal.go(decimal.Decimal mapping Decimal128)?
chart 1：

chart 2：