toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() {
final most = _toHex64(_mostSigBits);
final least = _toHex64(_leastSigBits);
final hex = most + least;
return '${hex.substring(0, 8)}-'
'${hex.substring(8, 12)}-'
'${hex.substring(12, 16)}-'
'${hex.substring(16, 20)}-'
'${hex.substring(20, 32)}';
}