Map.Ref
A reference type with instanceRef.value primed to return an existing instance of the
Map type, if available, or lazy load an instance upon accessing instanceRef.value.
    new Map.Ref(id, value)
  
  
  
  Parameters
- id {string}:string representing the record id 
- value {Object}:properties to be loaded / hydrated 
Returns
 {Map.Ref}: 
instance reference object for the id
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