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laplace(heaviside(t),t,s) doesn't return 1/s

var('s')
var('t',domain='positive')
laplace(heaviside(t),t,s)

returns an unevaluated function object in stead of returning 1/s. Other functions such as sin(t) and dirac_delta(t) seem to give the correct results. Is this just a blind spot in laplace, or do I need to refine my domains on s or t?

If this transform just isn't implemented, is there an easy way for me to patch it locally?