diff --git a/lib/push/apns-notif-creators.js b/lib/push/apns-notif-creators.js
--- a/lib/push/apns-notif-creators.js
+++ b/lib/push/apns-notif-creators.js
@@ -157,7 +157,7 @@
     messageInfos,
   };
 
-  const notificationSizeValidator = (notif: APNsVisualNotification) => {
+  const isNotificationSizeValid = (notif: APNsVisualNotification) => {
     const { headers, ...notifSansHeaders } = notif;
     return (
       encryptedNotifUtilsAPI.getNotifByteSize(
@@ -173,7 +173,7 @@
 
   const shouldBeEncrypted = canDecryptIOSNotif || canDecryptMacOSNotifs;
   if (!shouldBeEncrypted) {
-    const notificationToSend = notificationSizeValidator(copyWithMessageInfos)
+    const notificationToSend = isNotificationSizeValid(copyWithMessageInfos)
       ? copyWithMessageInfos
       : notification;
     const targetedNotifications = devices.map(({ deliveryID }) => ({
@@ -211,7 +211,7 @@
     devices,
     copyWithMessageInfos,
     platformDetails.codeVersion,
-    notificationSizeValidator,
+    isNotificationSizeValid,
   );
 
   const devicesWithExcessiveSizeNoHolders = notifsWithMessageInfos
diff --git a/lib/push/crypto.js b/lib/push/crypto.js
--- a/lib/push/crypto.js
+++ b/lib/push/crypto.js
@@ -27,7 +27,7 @@
   cryptoID: string,
   senderDeviceDescriptor: SenderDeviceDescriptor,
   unencryptedPayload: T,
-  payloadSizeValidator?: (
+  isPayloadSizeValid?: (
     | T
     | $ReadOnly<{
         ...SenderDeviceDescriptor,
@@ -51,16 +51,16 @@
     if (!unencryptedSerializedPayload) {
       return {
         resultPayload: unencryptedPayload,
-        payloadSizeExceeded: payloadSizeValidator
-          ? payloadSizeValidator(unencryptedPayload)
+        payloadSizeExceeded: isPayloadSizeValid
+          ? isPayloadSizeValid(unencryptedPayload)
           : false,
       };
     }
 
     let dbPersistCondition;
-    if (payloadSizeValidator) {
+    if (isPayloadSizeValid) {
       dbPersistCondition = (serializedPayload: string, type: '1' | '0') =>
-        payloadSizeValidator({
+        isPayloadSizeValid({
           encryptedPayload: serializedPayload,
           type,
           ...senderDeviceDescriptor,
@@ -94,8 +94,8 @@
     };
     return {
       resultPayload,
-      payloadSizeExceeded: payloadSizeValidator
-        ? payloadSizeValidator(resultPayload)
+      payloadSizeExceeded: isPayloadSizeValid
+        ? isPayloadSizeValid(resultPayload)
         : false,
     };
   }
@@ -106,7 +106,7 @@
   cryptoID: string,
   senderDeviceDescriptor: SenderDeviceDescriptor,
   notification: APNsVisualNotification,
-  notificationSizeValidator?: APNsVisualNotification => boolean,
+  isNotificationSizeValid?: APNsVisualNotification => boolean,
   codeVersion?: ?number,
   blobHolder?: ?string,
 ): Promise<{
@@ -150,9 +150,9 @@
     }
 
     let dbPersistCondition;
-    if (notificationSizeValidator) {
+    if (isNotificationSizeValid) {
       dbPersistCondition = (encryptedPayload: string, type: '0' | '1') =>
-        notificationSizeValidator({
+        isNotificationSizeValid({
           ...senderDeviceDescriptor,
           id,
           headers,
@@ -195,8 +195,8 @@
     const unencryptedNotification = { ...notification, encryptionFailed: '1' };
     return {
       notification: unencryptedNotification,
-      payloadSizeExceeded: notificationSizeValidator
-        ? !notificationSizeValidator(unencryptedNotification)
+      payloadSizeExceeded: isNotificationSizeValid
+        ? !isNotificationSizeValid(unencryptedNotification)
         : false,
     };
   }
@@ -274,7 +274,7 @@
   senderDeviceDescriptor: SenderDeviceDescriptor,
   cryptoID: string,
   notification: AndroidVisualNotification,
-  notificationSizeValidator?: AndroidVisualNotification => boolean,
+  isNotificationSizeValid?: AndroidVisualNotification => boolean,
   blobHolder?: ?string,
 ): Promise<{
   +notification: AndroidVisualNotification,
@@ -293,9 +293,9 @@
     unencryptedPayload = { ...unencryptedPayload, blobHolder };
   }
 
-  let payloadSizeValidator;
-  if (notificationSizeValidator) {
-    payloadSizeValidator = (
+  let isPayloadSizeValid;
+  if (isNotificationSizeValid) {
+    isPayloadSizeValid = (
       payload:
         | AndroidVisualNotificationPayload
         | $ReadOnly<{
@@ -304,7 +304,7 @@
             +type: '0' | '1',
           }>,
     ) => {
-      return notificationSizeValidator({
+      return isNotificationSizeValid({
         data: { ...unencryptedData, ...payload },
       });
     };
@@ -315,7 +315,7 @@
       cryptoID,
       senderDeviceDescriptor,
       unencryptedPayload,
-      payloadSizeValidator,
+      isPayloadSizeValid,
     );
   return {
     notification: {
@@ -452,7 +452,7 @@
   devices: $ReadOnlyArray<NotificationTargetDevice>,
   notification: APNsVisualNotification,
   codeVersion?: ?number,
-  notificationSizeValidator?: APNsVisualNotification => boolean,
+  isNotificationSizeValid?: APNsVisualNotification => boolean,
 ): Promise<
   $ReadOnlyArray<{
     +cryptoID: string,
@@ -470,7 +470,7 @@
         cryptoID,
         senderDeviceDescriptor,
         notification,
-        notificationSizeValidator,
+        isNotificationSizeValid,
         codeVersion,
         blobHolder,
       );
@@ -511,7 +511,7 @@
   senderDeviceDescriptor: SenderDeviceDescriptor,
   devices: $ReadOnlyArray<NotificationTargetDevice>,
   notification: AndroidVisualNotification,
-  notificationSizeValidator?: (
+  isNotificationSizeValid?: (
     notification: AndroidVisualNotification,
   ) => boolean,
 ): Promise<
@@ -530,7 +530,7 @@
         senderDeviceDescriptor,
         cryptoID,
         notification,
-        notificationSizeValidator,
+        isNotificationSizeValid,
         blobHolder,
       );
       return { deliveryID, cryptoID, ...notif };