Type-inference fails on stable melt fraction calculation

[ayushinav]

MWE

P = [3.0]
T = (1440:10:1480) .+ 273.0
T_solidus = [1450.0] .+ 273
Ch2o = 100.0
Cco2 = 1000.0

ps_nt = (; P, T, T_solidus, Ch2o, Cco2)
get_melt_fraction(ps_nt)
@test_opt get_melt_fraction(ps_nt)