$a x= 2**31; creates an empty string, so there's an overflow, so something is using an I32 or IV when it should be using a STRLEN. (If this error occurs on a 64-bit build, then it's an I32 being used.) Any substring starting at a position later than zero therefore starts outside of the string.

In reply to Re: substr outside of string? by ikegami
in thread substr outside of string? (Updated: Fixed in later builds.) by BrowserUk

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