Convert a temporal number to a span or to a bounding box

tnumber::{span,tbox}

SELECT tint '[1@2001-01-01, 2@2001-01-03]'::intspan;
-- [1, 3)
SELECT tfloat '(1@2001-01-01, 3@2001-01-03, 2@2001-01-05]'::floatspan;
-- (1, 3]
SELECT tfloat 'Interp=Step;(1@2001-01-01, 3@2001-01-03, 2@2001-01-05]'::floatspan;
-- [1, 3]

SELECT tint '[1@2001-01-01, 2@2001-01-03]'::tbox;
-- TBOXINT XT((1,2),[2001-01-01,2001-01-03])
SELECT tfloat '(1@2001-01-01, 3@2001-01-03, 2@2001-01-05]'::tbox;
-- TBOXFLOAT XT((1,3),[2001-01-01,2001-01-05])

Convert between a temporal Boolean and a temporal integer

tbool::tint

SELECT tbool '[true@2001-01-01, false@2001-01-03]'::tint;
-- [1@2001-01-01, 0@2001-01-03]

Convert between a temporal integer and a temporal float

tint::tfloat

tfloat::tint

SELECT tint '[1@2001-01-01, 2@2001-01-03]'::tfloat;
-- Interp=Step;[1@2001-01-01, 2@2001-01-03]
SELECT tint '[1@2001-01-01, 2@2001-01-03, 3@2001-01-05]'::tfloat;
-- Interp=Step;[1@2001-01-01, 2@2001-01-03, 3@2001-01-05]
SELECT tfloat 'Interp=Step;[1.5@2001-01-01, 2.5@2001-01-03]'::tint;
-- [1@2001-01-01, 2@2001-01-03]
SELECT tfloat '[1.5@2001-01-01, 2.5@2001-01-03]'::tint;
-- ERROR:  Cannot cast temporal float with linear interpolation to temporal integer