When computing an expression value for an index-on-expression or a CHECK

When computing an expression value for an index-on-expression or a CHECK
constraint and the expressions uses a REAL table column, but the value of
that column is an integer (in other words, when it is using the
store-real-as-integer optimization) be sure to promote the value to real
before evaluating the expression.  Ticket [57af00b6642ecd68].

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