@Override
  public String toString() {
    return fieldName + ":" + type + (isDeleted() ? ":DELETED" : "")
        + (isIdentityField() ? ":identity" : "") + ":" + fieldIndex
        + ((varLenFieldSeqId > 0) ? (":" + varLenFieldSeqId) : "")
        + ":idx0(relativeOffset)=" + relativeOffset + ":idx1(vlfOffsetIndex)="
        + vlfOffsetIndex;
  }
Used by {@link PdxInstanceImpl#equals(Object)} to act as if it has a field whose value is
always the default.
geode-core/src/main/java/org/apache/geode/pdx/internal/PdxField.java