pub const OPEN_SENTINEL: &str = "9999-12-31T23:59:59.999999Z";Expand description
The open-interval sentinel, in canonical form.
Widened from 9999-12-31T23:59:59Z in 0.5.4: a sentinel that is the one
value exempt from the canonical width is a carve-out that reintroduces the
very comparison bug the width exists to prevent. .999999 also makes the
sentinel the maximum representable instant, so ts < OPEN_SENTINEL holds
for every real timestamp — which is what a half-open interval needs.