Publicly export _sanitize_unicode_record

[steventlamb]

OTM2 uses a copy+pasted version of _sanitize_unicode_record to export JSON values. Consider unit testing this function and publicly exporting it.

[avelis]

👍 For this request. Exposure for personal enhancement would benefit this library immensely.

My specific use case is to be able to specify display formatting for datetime values in a given record.

[steventlamb]

out of scope, won't fix