value-bingding on <select> can't work with computed

[super...@163.com]

i found that a computed observable will run twice when it based on a obsevable binding to a <select>.

I tried to make it bind to a <input> then it works correctly.

I don't know the reason.Please help me.

[Gunnar Liljas]

A writable computed, that is?

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[Michael Best]

Try adding the valueAllowUnset: true binding to the select.