init

        pub fn init(init_values: EnumFieldStruct(E, bool, false)) Self {
            @setEvalBranchQuota(2 * @typeInfo(E).@"enum".field_names.len);
            var result: Self = .{};
            if (@typeInfo(E).@"enum".mode == .exhaustive) {
                inline for (0..Self.len) |i| {
                    const key = comptime Indexer.keyForIndex(i);
                    const tag = @tagName(key);
                    if (@field(init_values, tag)) {
                        result.bits.set(i);
                    }
                }
            } else {
                inline for (@typeInfo(E).@"enum".field_names) |field_name| {
                    const key = @field(E, field_name);
                    if (@field(init_values, field_name)) {
                        const i = comptime Indexer.indexOf(key);
                        result.bits.set(i);
                    }
                }
            }
            return result;
        }