Hashing opcodes work on strings instead of byte arrays

[vostrnad]

In your implementation of the script interpreter, hashing opcodes pop a stack item, convert it to a string and then hash it. However, in Bitcoin the stack items are always byte arrays, and interpreting them as strings results in inconsistencies.

For example, the script OP_0 OP_SHA256 should return the hash of an empty byte array, but it instead hashes the string "0".

[benalleng]

Good point! I've been thinking about how to migrate this to a more faithful representation of how bitcoin deals with bytes vs our admittedly largely abstracted string based logic