Commits on Mar 12, 2020

1. json: AppendTimeLayout should add field separators …

   In #786, we added support for improving the performance of encoding time
   by allowing encoder implementations to implement AppendTimeLayout.
   
   If the encoder implements, `AppendTimeLayout(time.Time, string)`, some
   of the time encoders shipped with Zap will use that method, which in
   turn can make use of `Buffer.AppendTime`.
   
   That change inadvertently broke the JSON output for arrays of time that
   make use of that functionality.
   
   Compare the old version of AppendTimeLayout with AppendString (both
   operations append a string to the array).
   
       func (enc *jsonEncoder) AppendString(val string) {
         enc.addElementSeparator()
         enc.buf.AppendByte('"')
         // ...
       }
   
       func (enc *jsonEncoder) AppendTimeLayout(time time.Time, layout string) {
         enc.buf.AppendByte('"')
         // ...
       }
   
   Without the `enc.addElementSeparator` call, `AppendTimeLayout` does not
   include the `,` separator between array elements, instead yielding the
   following.
   
       ["2001-12-19T00:00:00Z""2002-12-18T00:00:00Z""2003-12-17T00:00:00Z"]
   
   Fixes #798

   

   abhinav committed Mar 12, 2020
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