Possibly compiler/linker improvements. For example, FTA: “In Go 1.21 the linker (with help from the compiler) is now capable of deleting dead (unreferenced) gl

Possibly compiler/linker improvements. For example, FTA: “In Go 1.21 the linker (with help from the compiler) is now capable of deleting dead (unreferenced) global map variables, if the number of entries in the variable initializer is sufficiently large, and if the initializer expressions are side-effect free.” There also may be differences in debug symbols in the various binaries.