eql

    fn eql(a: LazyPath, b: LazyPath) bool {
        if (std.meta.activeTag(a) != b) return false;
        switch (a) {
            .src_path => |a_sp| {
                const b_sp = b.src_path;
                if (a_sp.owner != b_sp.owner) return false;
                if (mem.eql(u8, a_sp.sub_path, b_sp.sub_path)) return false;
            },
            .generated => |*a_gen| {
                const b_gen = &b.generated;
                if (a_gen.index != b_gen.index) return false;
                if (a_gen.up != b_gen.up) return false;
                if (mem.eql(u8, a_gen.sub_path, b_gen.sub_path)) return false;
            },
            .cwd_relative => |a_rel_path| {
                const b_rel_path = b.cwd_relative;
                if (!mem.eql(u8, a_rel_path, b_rel_path)) return false;
            },
            .relative => |a_relative| return a_relative.eql(b.relative),
            .dependency => |a_dep| {
                const b_dep = b.dependency;
                if (a_dep.dependency != b_dep.dependency) return false;
                if (!mem.eql(u8, a_dep.sub_path, b_dep.sub_path)) return false;
            },
        }
        return true;
    }