PhpTimeConverter::convertTime() threw an uncaught
InvalidArgumentException for v1/v6 UUID timestamps within about
100 microseconds of the Unix epoch (on the pre-1970 side), because
PHP renders such small floats in scientific notation, which
splitTime() misparsed as a malformed microseconds fragment.
splitTime() now recognizes scientific notation and defers to the
existing GenericTimeConverter fallback, the same mechanism already
used for other precision-loss cases.
dualfroz