Error writing MPS file

[jajhall]

The following model has an optimal objective of -10

import highspy as hp

m = hp.Highs()

x = m.addVariable(-hp.kHighsInf, 1, 1, type=hp.HighsVarType.kInteger, name="x")

m.addConstr(x >= -10, name="c1")

but when written to an MPS file the line

MI BOUND x

is omitted, so the variable is in {0, 1}, giving an optimal objective of 0