FEAT: initial version

Author: Oldes

.editorconfig

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+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+indent_size = 4
+
+[*.{r,r3,reb,c,h,cpp}]
+indent_style = tab
+
+[*.{r,r3,reb}]
+charset = utf-8
+
+[*.{bat,vcproj,vcxproj,sln,vbs,rc}]
+end_of_line = crlf
+
+[*.{yml}]
+indent_style = space
+indent_size = 2
+
+[LICENSE]
+end_of_line = crlf

.gitignore

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+/*
+!/.gitignore
+!/.github
+!/.editorconfig
+!/rebol
+!/src
+!/test
+!/Rebol-Test-Extension.nest

rebol/src/include/ext-types.h

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+/***********************************************************************
+**
+**  REBOL [R3] Language Interpreter and Run-time Environment
+**  Copyright 2012 REBOL Technologies
+**  Copyright 2012-2021 Rebol Open Source Contributors
+**  REBOL is a trademark of REBOL Technologies
+**  Licensed under the Apache License, Version 2.0
+**  This is a code-generated file.
+**
+************************************************************************
+**
+**  Title: Extension Types (Isolators)
+**  Build: 3.5.3
+**  Date:  4-May-2021
+**  File:  ext-types.h
+**
+**  AUTO-GENERATED FILE - Do not modify. (From: make-boot.reb)
+**
+***********************************************************************/
+
+
+enum REBOL_Ext_Types
+{
+	RXT_END = 0,                  // 0
+	RXT_UNSET,                    // 1
+	RXT_NONE,                     // 2
+	RXT_HANDLE,                   // 3
+	RXT_LOGIC = 4,                // 4
+	RXT_INTEGER,                  // 5
+	RXT_DECIMAL,                  // 6
+	RXT_PERCENT,                  // 7
+	RXT_CHAR = 10,                // 8
+	RXT_PAIR,                     // 9
+	RXT_TUPLE,                    // 10
+	RXT_TIME,                     // 11
+	RXT_DATE,                     // 12
+	RXT_WORD = 16,                // 13
+	RXT_SET_WORD,                 // 14
+	RXT_GET_WORD,                 // 15
+	RXT_LIT_WORD,                 // 16
+	RXT_REFINEMENT,               // 17
+	RXT_ISSUE,                    // 18
+	RXT_STRING = 24,              // 19
+	RXT_FILE,                     // 20
+	RXT_EMAIL,                    // 21
+	RXT_REF,                      // 22
+	RXT_URL,                      // 23
+	RXT_TAG,                      // 24
+	RXT_BLOCK = 32,               // 25
+	RXT_PAREN,                    // 26
+	RXT_PATH,                     // 27
+	RXT_SET_PATH,                 // 28
+	RXT_GET_PATH,                 // 29
+	RXT_LIT_PATH,                 // 30
+	RXT_BINARY = 40,              // 31
+	RXT_BITSET,                   // 32
+	RXT_VECTOR,                   // 33
+	RXT_IMAGE,                    // 34
+	RXT_GOB = 47,                 // 35
+	RXT_OBJECT = 48,              // 36
+	RXT_MODULE,                   // 37
+    RXT_MAX
+};