Rename Fn::Size to Fn::Length

Rename Fn::Size to Fn::Length

Author: Jue Gong

RFCs/0070-Fn::Size.md renamed to RFCs/0070-Fn::Length.md

@@ -1,11 +1,11 @@
-# RFC for Fn::Size
+# RFC for Fn::Length
 
 * **Original Author(s):**: @juegong2
 * **Tracking Issue**: https://github.com/aws-cloudformation/cfn-language-discussion/issues/70
 
 # Summary
 
-We will support an intrinsic function called `Fn::Size` that will return the number of elements in a given list.
+We will support an intrinsic function called `Fn::Length` that will return the number of elements in a given list.
 
 # Motivation
 
@@ -32,15 +32,15 @@ Use `Ref` on a Parameter of type `CommaDelimitedList` or `List<Number>`
     "Has3InstanceTypes": {
       "Fn::Equals": [
         {
-          "Fn::Size": {"Ref": "InstanceTypes"}
+          "Fn::Length": {"Ref": "InstanceTypes"}
         },
         3
       ]
     },
     "Has2NumbersInList": {
       "Fn::Equals": [
         {
-          "Fn::Size": {"Ref": "NumberList"}
+          "Fn::Length": {"Ref": "NumberList"}
         },
         2
       ]
@@ -56,7 +56,7 @@ Use a hardcoded list
     "Has3InstanceTypes": {
       "Fn::Equals": [
         {
-          "Fn::Size": [ "m5.large", "m5.xlarge" ]
+          "Fn::Length": [ "m5.large", "m5.xlarge" ]
         },
         3
       ]
@@ -67,10 +67,10 @@ Use a hardcoded list
 
 # Limitation
 
-`Fn::Size` will not work with lists that are dynamically generated at provisinoing time. For example, assuming MyBucket is the logical id of a AWS::S3::Bucket resource, the following is not supported:
+`Fn::Length` will not work with lists that are dynamically generated at provisinoing time. For example, assuming MyBucket is the logical id of a AWS::S3::Bucket resource, the following is not supported:
 ```json
 {
-  "Fn::Size": { "Fn::Split": [":", { "Fn::GetAtt": [ "MyBucket", "Arn" ] } ] }
+  "Fn::Length": { "Fn::Split": [":", { "Fn::GetAtt": [ "MyBucket", "Arn" ] } ] }
 }
 ```
 because the ARN of MyBucket is not known until during provisioning.
@@ -79,7 +79,7 @@ because the ARN of MyBucket is not known until during provisioning.
 
 # Details
 
-`Fn::Size` is an intrinsic function that takes in a list and returns the size of the given list. The list could be:
+`Fn::Length` is an intrinsic function that takes in a list and returns the length of the given list. The list could be:
 
 * hardcoded list in template
 * array generated by intrinsic functions like `Fn::Split` with parameters of hardcoded values or of `Ref` to template parameters
@@ -91,7 +91,7 @@ because the ARN of MyBucket is not known until during provisioning.
   * `AWS::SSM::Parameter::Value<CommaDelimitedList>`
   * `AWS::SSM::Parameter::Value<List<AWS-specific parameter type>>`
 
-Within `Fn::Size`, following intrinsic functions with parameters of hardcoded values or of `Ref` to template parameters will be supported:
+Within `Fn::Length`, following intrinsic functions with parameters of hardcoded values or of `Ref` to template parameters will be supported:
 * Condition functions
 * Fn::FindInMap
 * Fn::Base64
@@ -101,6 +101,6 @@ Within `Fn::Size`, following intrinsic functions with parameters of hardcoded va
 * Fn::Sub
 
 # FAQ
-1. **Will the CloudFormation Linter (cfn-lint) support validations regarding Fn::Size?**
+1. **Will the CloudFormation Linter (cfn-lint) support validations regarding Fn::Length?**
 
-    Yes. cfn-lint will be updated to validate if the parameter of Fn::Size is a list. It will also validate if it is used for integer-type resource properties or function parameters.
+    Yes. cfn-lint will be updated to validate if the parameter of Fn::Length is a list. It will also validate if it is used for integer-type resource properties or function parameters.