Do not force 32 bits in JS math operations

[richcarl]

The "n | 0" is a hack to truncate numbers, but it forces n to 32 bits, which is inconsistent with the expected precision of 54 integer bits using the JS backend. For example, truncate(2147483648) yields -2147483648 (negative), and similarly, 21474836481 // 10 yields -2147483648.

[github-actions[bot]]

Thanks for suggesting these code changes. To set expectations:

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