creating tradition hibernate usertype - does ismutable() mean?

i am formulating tradition usertype hibernate project. comparatively candid until i came ismutable method. i am perplexing figure out slight means, contract-wise.

does meant category i am formulating usertype permanent does meant vigilant binds anxiety an instance category never indicate opposite instance?

i found examples where returned true, since vigilant itself changeable - .

other examples village wiki returned fake but addressing why, even nonetheless also mutable.

i have checked javadoc, nonetheless it's unequivocally pristine either.

from javadoc :

public boolean ismutable()
    objects form mutable?
    returns:
        boolean

from javadoc :

public boolean ismutable()
    objects form mutable. (with honour referencing
    vigilant ... entities collections deliberate permanent because
    control possess middle state.)
    returns:
        boolean