What is the standard practice between required fields of a struct you're 
expecting to deserialize using JSON, and using pointers for this (if 
there's any correlation)?

API defined a string as required.  Do you define it as a string and check 
for zero-value for that type, or *string and check for nil, etc.?  Any 
other situations/instances were it's best practice to user a pointer for 
defining struct fields over the standard type?

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