XS: String.raw truncates the raw object's length to 32 bits

[d01c2]

Build environment: macOS 26.5.2

Moddable SDK version:

• Installed via jsvu, so there is no SDK source tree / git describe.
• Engine reports: XS 17.9.1, slot 32 bytes, ID 4 bytes

Target device: desktop (host xs)

Description
String.raw obtains its literal segment count with LengthOfArrayLike, which applies ToLength and clamps the value into the range 0 to 2**53 - 1.

XS truncates it to a 32-bit integer instead, so a length of Infinity becomes 0 and takes the "return the empty String" path without reading any segment.

Steps to Reproduce

$ xst -e 'var raw = { length: Infinity }; Object.defineProperty(raw, "0", { get() { throw new Error("reached index 0"); } }); print(JSON.stringify(String.raw.call(0, { raw })));'
""

Expected behavior
The clamped segment count is 2**53 - 1, so the loop reads index 0 and the getter's Error propagates.

For comparison, V8 (15.4.18):

$ v8 -e 'var raw = { length: Infinity }; Object.defineProperty(raw, "0", { get() { throw new Error("reached index 0"); } }); print(JSON.stringify(String.raw.call(0, { raw })));'
Error: reached index 0

Other information
The truncation is directly observable. A length of 2**32 + 3 wraps to 3 and produces exactly three segments, and a length of 2**31 becomes negative and yields the empty string:

$ xst -e 'print(String.raw.call(0, { raw: { length: Math.pow(2, 32) + 3 } }))'
undefinedundefinedundefined
$ xst -e 'print(JSON.stringify(String.raw.call(0, { raw: { length: Math.pow(2, 31) } })))'
""