uint and int refuse values past the JavaScript safe-integer ceiling
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调研方向
Start with src/compact_encoding/integer.py and read how MAX_SAFE_INTEGER is applied to integer codecs. Run the conformance cases int-past-range, int-past-range-min, uint-decode-ceiling, and uint56-decode-ceiling. Done means Python integers beyond the JavaScript safe-integer ceiling encode and decode according to the expected corpus results instead of being refused.
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描述
Found by running the compact-encoding-test conformance corpus against this port.
uint, int and the fixed-width codecs refuse values above 9007199254740991, the largest integer a JavaScript double holds exactly:
import compact_encoding as c
c.encode(c.int, 4503599627370496) # ValueError: integer is greater than the maximum safe integer
c.uint.decode(c.State(bytes.fromhex('ff0000000000002000'))) # ValueError: uint is greater than the maximum safe integer
c.uint56.decode(c.State(bytes.fromhex('00000000000020'))) # ValueError: uint is greater than the maximum safe integer
The ceiling comes from MAX_SAFE_INTEGER in src/compact_encoding/integer.py, mirroring the reference. The corpus treats it as the reference's limit rather than the format's: per holepunchto/compact-encoding-test#120 and #128, int writes 4503599627370496 as ff0000000000002000 and -4503599627370497 as ff0100000000002000, and both decodes return 9007199254740992. An implementation may refuse a value its number type cannot hold (the unrepresentable outcome), but Python's int holds all of them, so the refusal is a divergence (holepunchto/compact-encoding-test#19).
The corpus cases are int-past-range and int-past-range-min (rule signed-range), and uint-decode-ceiling and uint56-decode-ceiling (rule decode-ceiling).
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