isLowSurrogate
Determines if the given char value is a Unicode low-surrogate code unit (also known as trailing-surrogate code unit).
Such values do not represent characters by themselves, but are used in the representation of #supplementary in the UTF-16 encoding.
Return
true if the char value is between .MIN_LOW_SURROGATE and .MAX_LOW_SURROGATE inclusive; false otherwise.
Since
1.5
Parameters
ch
the char value to be tested.