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After reading What's the rationale for null terminated strings? and some similar questions I have found that in C#/.NET strings are, internally, both length-prefixed and null terminated like in BSTR Data Type.
What is the reason strings are both length-prefixed and null terminated instead of eg. only length-prefixed?
Length prefixed so that computing length is
O(1).Null terminated to make marshaling to unmanaged blazing fast (unmanaged likely expects null-terminated strings).