Improve computed property lookup error messages #1179
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QuickJS reported "cannot read property of null" for computed property lookups (`a[k]` where `a === null`), which is markedly less helpful than "cannot read property 'foo' of null".
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QuickJS reported "cannot read property of null" for computed property lookups (
a[k]wherea === null), which is markedly less helpful than "cannot read property 'foo' of null".