Update Internals.md

Author: antonmedv

docs/Internals.md

@@ -1,13 +1,14 @@
 # Internals
 
-Expr is a stack based virtual machine. It compiles expressions to bytecode and 
-runs it. 
+Expr is a stack based virtual machine. It compiles expressions to bytecode and
+runs it.
 
 Compilation is done in a few steps:
+
 - Parse expression to AST
 - Type check AST
-  - Apply operator overloading
-  - Apply custom AST patching
+    - Apply operator overloading
+    - Apply custom AST patching
 - Optimize AST
 - Compile AST to a bytecode
 
@@ -19,7 +20,7 @@ Compiler has a bunch of optimization which will produce a more optimal program.
 value in ['foo', 'bar', 'baz']
 ```
 
-If Expr finds an `in` or `not in` expression with an array, it will be 
+If Expr finds an `in` or `not in` expression with an array, it will be
 transformed into:
 
 ```js
@@ -28,11 +29,11 @@ value in {"foo": true, "bar": true, "baz": true}
 
 ## Constant folding
 
-Arithmetic expressions with constants is computed on compile step and replaced 
+Arithmetic expressions with constants is computed on compile step and replaced
 with the result.
 
 ```js
--(2-5)**3-2/(+4-3)+-2
+-(2 - 5) ** 3 - 2 / (+4 - 3) + -2
 ```
 
 Will be compiled to just single number:
@@ -44,7 +45,8 @@ Will be compiled to just single number:
 ## In range
 
 ```js
-user.Age in 18..32
+user.Age in 18.
+.32
 ```
 
 Will be replaced with a binary operator:
@@ -56,7 +58,8 @@ Will be replaced with a binary operator:
 ## Const range
 
 ```js
-1..10_000
+1.
+.10_000
 ```
 
 Ranges computed on compile stage, replaced with precreated slices.
@@ -77,3 +80,5 @@ fib(42)
 Will be replaced with result of `fib(42)` on the compile step.
 
 [ConstExpr Example](https://pkg.go.dev/github.com/antonmedv/expr?tab=doc#ConstExpr)
+
+* Next: [Tips](Tips.md)