* lread.c (hash_string): Use size_t, not int, for hash computation.
Normally we prefer signed values; but hashing is special, because it's better to use unsigned division on hash table sizes so that the remainder is nonnegative. Also, size_t is the natural width for hashing into memory. The previous code used 'int', which doesn't retain enough info to hash well into very large tables. (oblookup, oblookup_last_bucket_number, Funintern): Likewise.
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