In commit 4100572 "Handle DW_FORM_implicit_const for DW_AT_decl_line", I added code to ensure that for an attribute DW_AT_decl_line, same-valued DW_FORM_implicit_const and DW_FORM_data1 are hashed equally in checksum_die, and found to be equal in die_eq_1. It would be good to cover this for more attributes. This was discussed on the ml here: - https://sourceware.org/pipermail/dwz/2021q1/000872.html - https://sourceware.org/pipermail/dwz/2021q1/000873.html