I am reading a PIC16 flash image from the target (oh instance IntelHex16bit), and merging it with a new image (nh instance IntelHex16bit) and get the following error:
nh.merge(oh[base:base+size], overlap='replace')
File "C:\Users\md84189\AppData\Local\Programs\Python\Python39\lib\site-packages\intelhex_init_.py", line 964, in getitem init.py", line 964, in getitem
addr1 = addr16 * 2
TypeError: unsupported operand type(s) for *: 'slice' and 'int'

If both instances are IntelHex or if nh instance is IntelHex and oh remains IntelHex16bit, the operation completes.

Note: Using Python 3.9.0, intelhex-2.3.0