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The tail operator:

  • can only be applied to string values and byte vectors
  • can only replace the end of e.g. a string value
  • cannot shrink the size of a string value, only grow or remain in size
  • cannot create output field value if delta value is not present in the stream

The delta operator:

  • can be applied to numbers, strings and byte vectors
  • can replace either the beginning or end of a string value
  • can shrink the size of a string
  • can use just previous or initial value (if tail value is not present in the stream) for the output field value.