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Define the index range of a byte sequence #242

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GPHemsley opened this issue Mar 29, 2019 · 1 comment

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GPHemsley commented Mar 29, 2019

AFAICT, it's not defined how to index into a byte sequence, but it probably should be.

The mimesniff spec already says things like "where the first byte is index 0", and I filed W3C bug 28519 with the following description:

Make explicit the fact that an index beyond the length of the sequence yields undefined.

But these things should probably come from infra, not be exclusive to mimesniff.

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domenic commented Mar 31, 2019

Note that for lists, we say

The index cannot be out-of-bounds, except when used with exists.

I.e., you should basically guard any potentially-out-bounds index access with "if x[i] exists" or "if i >= x's size"

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