IntField question

[Wei Wang]

IntField inherits from Field class a function called setByteValue().
However, if we call it, it gives an error message:

java.lang.IllegalArgumentException: cannot change value type from Integer
to Byte

1. If this not allowed for IntField, and there is no ByteField, how will
function setByteValue() be used?

2. Will IntField automatically detect value range is small and use less
space? I understand DocValuesField can save space by using variable length
codec, but not sure about IntField.

Thanks.