Write a function that takes a binary tree and returns true if it's a valid binary search tree. Consider edge cases including duplicate values, integer overflow, and the definition you're using for validity.

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Write a function that takes a binary tree and returns true if it's a valid binary search tree. Consider edge cases including duplicate values, integer overflow, and the definition you're using for validity.

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