object[] a1 = new string[3];	// Legal object[] a2 = new int[3]; 	// Error

why is that? why int cant implicitly be converted to an object?
isnt int type of object?

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Array covariance specifically does not extend to arrays of value-types. For
example, no conversion exists that permits an int[] to be treated as an
object[]."

When you pass an int[], it gets loaded into an object[] of length 1 and
passed to your method.

alright , now it is clear

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