Uniform (and not redundant) treatment of "0x" with to_hex() #998
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to_hex() produces strings beginning with "0x" and in almost all usage, it is preceded by "0x", producing double "0x0xA1B2C3D4".
To make coherent, "0x" is removed from the to_hex() function and added in the two places where it is not already present in the caller.