Proxy [[Construct]]

[Tom Schuster]

The Proxy [[Construct]] method 9.5.14, has the step 7.a
"If target does not have a [[Construct]] internal method, throw a TypeError
exception."

But a proxy only has a [[Construct]] internal method when the target has a
[[Construct]] internal method. I am not aware that an object can lose an
internal method during runtime.
[[Call]] doesn't have a check like this either. Could this check be turned
into an assert?
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