Schemas for the mongo backend are managed by lightblue. Therefore it's important to understand how metadata field types are mapped to mongo data types. Or more specifically to BSON types.

metadata mongo notes
binary String encoding handled by clients
boolean Boolean
date String format: YYYYMMDDTHH:mm:ss.SSS+-ZZZZ (note T is a literal string)
integer 64-bit integer
double Double
biginteger String operators < and > not allowed during search
bigdecimal String operators < and > not allowed during search
string String
uid String
object Object
array Array
reference N/A only used for find

Note there is a special case for any field named _id. For these fields, they are mapped to BSON Object Id if the structure matches the BSON ObjectID type.

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