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### What does this PR do? Fixes a small bug I found in https://github.com/oven-sh/bun/pull/23107 which caused `SlicedString` not to correctly provide us with subslices. This would have been a **killer** use-case for the interval utility we decided to reject in https://github.com/oven-sh/bun/pull/23882. Consider how nice the code could've been: ```zig pub inline fn sub(this: SlicedString, input: string) SlicedString { const buf_r = bun.math.interval.fromSlice(this.buf); const inp_r = bun.math.interval.fromSlice(this.input); if (Environment.allow_assert) { if (!buf_r.superset(inp_r)) { bun.Output.panic("SlicedString.sub input [{}, {}) is not a substring of the " ++ "slice [{}, {})", .{ start_i, end_i, start_buf, end_buf }); } } return SlicedString{ .buf = this.buf, .slice = input }; } ``` That's a lot more readable than the middle-school algebra we have here, but here we are. ### How did you verify your code works? CI Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>