diff --git a/src/newtypes/common.rs b/src/newtypes/common.rs
index 88ffac7..0136b54 100644
--- a/src/newtypes/common.rs
+++ b/src/newtypes/common.rs
@@ -1,3 +1,7 @@
+pub const fn flag(b:bool,mask:u8)->u8{
+	(-(b as i8) as u8)&mask
+}
+
 #[binrw::binrw]
 #[brw(little,repr=u8)]
 pub enum Boolio{
diff --git a/src/newtypes/gameplay_attributes.rs b/src/newtypes/gameplay_attributes.rs
index f544ec5..0dd3501 100644
--- a/src/newtypes/gameplay_attributes.rs
+++ b/src/newtypes/gameplay_attributes.rs
@@ -1,9 +1,10 @@
+use super::common::{flag,Boolio};
 use super::integer::{Time,Planar64,Planar64Vec3};
 
 #[binrw::binrw]
 #[brw(little)]
 pub struct ContactingLadder{
-	pub sticky:super::common::Boolio,
+	pub sticky:Boolio,
 }
 impl Into<strafesnet_common::gameplay_attributes::ContactingLadder> for ContactingLadder{
 	fn into(self)->strafesnet_common::gameplay_attributes::ContactingLadder{
@@ -325,10 +326,10 @@ impl Into<strafesnet_common::gameplay_attributes::GeneralAttributes> for General
 impl From<strafesnet_common::gameplay_attributes::GeneralAttributes> for GeneralAttributes{
 	fn from(value:strafesnet_common::gameplay_attributes::GeneralAttributes)->Self{
 		let header=
-		value.booster.is_some() as u8&GeneralAttributes::BOOSTER
-		|value.trajectory.is_some() as u8&GeneralAttributes::TRAJECTORY
-		|value.wormhole.is_some() as u8&GeneralAttributes::WORMHOLE
-		|value.accelerator.is_some() as u8&GeneralAttributes::ACCELERATOR;
+		flag(value.booster.is_some(),GeneralAttributes::BOOSTER)
+		|flag(value.trajectory.is_some(),GeneralAttributes::TRAJECTORY)
+		|flag(value.wormhole.is_some(),GeneralAttributes::WORMHOLE)
+		|flag(value.accelerator.is_some(),GeneralAttributes::ACCELERATOR);
 		Self{
 			header,
 			booster:value.booster.map(Into::into),
@@ -359,7 +360,7 @@ impl Into<strafesnet_common::gameplay_attributes::ContactingAttributes> for Cont
 impl From<strafesnet_common::gameplay_attributes::ContactingAttributes> for ContactingAttributes{
 	fn from(value:strafesnet_common::gameplay_attributes::ContactingAttributes)->Self{
 		Self{
-			header:value.contact_behaviour.is_some() as u8&ContactingAttributes::CONTACTING_BEHAVIOUR,
+			header:flag(value.contact_behaviour.is_some(),ContactingAttributes::CONTACTING_BEHAVIOUR),
 			contact_behaviour:value.contact_behaviour.map(Into::into),
 		}
 	}
@@ -385,7 +386,7 @@ impl Into<strafesnet_common::gameplay_attributes::IntersectingAttributes> for In
 impl From<strafesnet_common::gameplay_attributes::IntersectingAttributes> for IntersectingAttributes{
 	fn from(value:strafesnet_common::gameplay_attributes::IntersectingAttributes)->Self{
 		Self{
-			header:value.water.is_some() as u8&IntersectingAttributes::INTERSECTING_WATER,
+			header:flag(value.water.is_some(),IntersectingAttributes::INTERSECTING_WATER),
 			water:value.water.map(Into::into),
 		}
 	}
diff --git a/src/newtypes/gameplay_modes.rs b/src/newtypes/gameplay_modes.rs
index 12e1e8e..b789427 100644
--- a/src/newtypes/gameplay_modes.rs
+++ b/src/newtypes/gameplay_modes.rs
@@ -1,3 +1,5 @@
+use super::common::flag;
+
 #[binrw::binrw]
 #[brw(little)]
 pub struct StageElement{
@@ -47,8 +49,8 @@ impl From<strafesnet_common::gameplay_modes::StageElement> for StageElement{
 		};
 		let header=
 			behaviour
-			|value.jump_limit().is_some() as u8&StageElement::JUMP_LIMIT
-			|value.force() as u8&StageElement::FORCE;
+			|flag(value.jump_limit().is_some(),StageElement::JUMP_LIMIT)
+			|flag(value.force(),StageElement::FORCE);
 		Self{
 			header,
 			stage_id:value.stage_id().get(),
diff --git a/src/newtypes/gameplay_style.rs b/src/newtypes/gameplay_style.rs
index e68ad69..b39bf94 100644
--- a/src/newtypes/gameplay_style.rs
+++ b/src/newtypes/gameplay_style.rs
@@ -1,3 +1,4 @@
+use super::common::flag;
 use super::integer::{Time,Ratio64,Planar64,Planar64Vec3};
 
 pub type Controls=u32;
@@ -55,12 +56,12 @@ impl Into<strafesnet_common::gameplay_style::StyleModifiers> for StyleModifiers{
 impl From<strafesnet_common::gameplay_style::StyleModifiers> for StyleModifiers{
 	fn from(value:strafesnet_common::gameplay_style::StyleModifiers)->Self{
 		let header=
-			value.strafe.is_some() as u8&StyleModifiers::STRAFE
-			|value.rocket.is_some() as u8&StyleModifiers::ROCKET
-			|value.jump.is_some() as u8&StyleModifiers::JUMP
-			|value.walk.is_some() as u8&StyleModifiers::WALK
-			|value.ladder.is_some() as u8&StyleModifiers::LADDER
-			|value.swim.is_some() as u8&StyleModifiers::SWIM;
+			flag(value.strafe.is_some(),StyleModifiers::STRAFE)
+			|flag(value.rocket.is_some(),StyleModifiers::ROCKET)
+			|flag(value.jump.is_some(),StyleModifiers::JUMP)
+			|flag(value.walk.is_some(),StyleModifiers::WALK)
+			|flag(value.ladder.is_some(),StyleModifiers::LADDER)
+			|flag(value.swim.is_some(),StyleModifiers::SWIM);
 		Self{
 			header,
 			controls_mask:value.controls_mask.bits(),
@@ -185,7 +186,7 @@ impl Into<strafesnet_common::gameplay_style::StrafeSettings> for StrafeSettings{
 impl From<strafesnet_common::gameplay_style::StrafeSettings> for StrafeSettings{
 	fn from(value:strafesnet_common::gameplay_style::StrafeSettings)->Self{
 		let (enable,mv,air_accel_limit,tick_rate)=value.into_inner();
-		let header=air_accel_limit.is_some() as u8&StrafeSettings::AIR_ACCEL_LIMIT;
+		let header=flag(air_accel_limit.is_some(),StrafeSettings::AIR_ACCEL_LIMIT);
 		Self{
 			header,
 			enable:enable.into(),
diff --git a/src/newtypes/model.rs b/src/newtypes/model.rs
index e8eb657..6b874d0 100644
--- a/src/newtypes/model.rs
+++ b/src/newtypes/model.rs
@@ -1,3 +1,4 @@
+use super::common::flag;
 use strafesnet_common::model::PolygonIter;
 
 use super::integer::{Planar64Vec3,Planar64Affine3};
@@ -76,7 +77,7 @@ impl Into<strafesnet_common::model::RenderConfig> for RenderConfig{
 }
 impl From<strafesnet_common::model::RenderConfig> for RenderConfig{
 	fn from(value:strafesnet_common::model::RenderConfig)->Self{
-		let header=value.texture.is_some() as u8&RenderConfig::TEXTURE;
+		let header=flag(value.texture.is_some(),RenderConfig::TEXTURE);
 		Self{
 			header,
 			texture:value.texture.map(|texture_id|texture_id.get()),