diff --git a/CMakeLists.txt b/CMakeLists.txt
index e3c388f..d49806f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.20)
 include(cmake/color.cmake)
 
-set(BLT_VERSION 0.18.14)
+set(BLT_VERSION 0.18.15)
 set(BLT_TEST_VERSION 0.0.1)
 
 set(BLT_TARGET BLT)
diff --git a/arg_parse_variant_map.drawio b/arg_parse_variant_map.drawio
index ac232d8..509f3a5 100644
--- a/arg_parse_variant_map.drawio
+++ b/arg_parse_variant_map.drawio
@@ -4,7 +4,7 @@
       <root>
         <mxCell id="0" />
         <mxCell id="1" parent="0" />
-        <mxCell id="_DS3495almi1g_SXSTfi-13" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-1" target="_DS3495almi1g_SXSTfi-3">
+        <mxCell id="_DS3495almi1g_SXSTfi-13" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-1" target="_DS3495almi1g_SXSTfi-3">
           <mxGeometry relative="1" as="geometry">
             <Array as="points">
               <mxPoint x="440" y="240" />
@@ -12,7 +12,7 @@
             </Array>
           </mxGeometry>
         </mxCell>
-        <mxCell id="_DS3495almi1g_SXSTfi-14" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-1" target="_DS3495almi1g_SXSTfi-2">
+        <mxCell id="_DS3495almi1g_SXSTfi-14" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-1" target="_DS3495almi1g_SXSTfi-2">
           <mxGeometry relative="1" as="geometry">
             <Array as="points">
               <mxPoint x="440" y="240" />
@@ -23,25 +23,25 @@
         <mxCell id="_DS3495almi1g_SXSTfi-1" value="&lt;div&gt;&lt;p style=&quot;font-family:&#39;JetBrains Mono&#39;,monospace;font-size:9.8pt;&quot;&gt;&lt;span style=&quot;background-color: rgb(255, 248, 247);&quot;&gt;arg_data_t&lt;/span&gt;&lt;/p&gt;&lt;/div&gt;" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
           <mxGeometry x="380" y="130" width="120" height="60" as="geometry" />
         </mxCell>
-        <mxCell id="_DS3495almi1g_SXSTfi-15" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-2" target="_DS3495almi1g_SXSTfi-5">
+        <mxCell id="_DS3495almi1g_SXSTfi-15" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-2" target="_DS3495almi1g_SXSTfi-5">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
         <mxCell id="_DS3495almi1g_SXSTfi-2" value="&lt;div&gt;&lt;pre style=&quot;font-family:&#39;JetBrains Mono&#39;,monospace;font-size:9.8pt;&quot;&gt;&lt;font style=&quot;background-color: rgb(252, 245, 245);&quot; color=&quot;#030303&quot;&gt;arg_data_vec_t&lt;/font&gt;&lt;/pre&gt;&lt;/div&gt;" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
           <mxGeometry x="560" y="280" width="150" height="60" as="geometry" />
         </mxCell>
-        <mxCell id="_DS3495almi1g_SXSTfi-10" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-3" target="_DS3495almi1g_SXSTfi-6">
+        <mxCell id="_DS3495almi1g_SXSTfi-10" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-3" target="_DS3495almi1g_SXSTfi-6">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
-        <mxCell id="_DS3495almi1g_SXSTfi-11" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-3" target="_DS3495almi1g_SXSTfi-7">
+        <mxCell id="_DS3495almi1g_SXSTfi-11" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-3" target="_DS3495almi1g_SXSTfi-7">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
-        <mxCell id="_DS3495almi1g_SXSTfi-12" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-3" target="_DS3495almi1g_SXSTfi-9">
+        <mxCell id="_DS3495almi1g_SXSTfi-12" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-3" target="_DS3495almi1g_SXSTfi-9">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
         <mxCell id="_DS3495almi1g_SXSTfi-3" value="&lt;div&gt;&lt;pre style=&quot;font-family:&#39;JetBrains Mono&#39;,monospace;font-size:9.8pt;&quot;&gt;&lt;font style=&quot;background-color: rgb(255, 248, 247);&quot; color=&quot;#030303&quot;&gt;arg_data_internal_t&lt;/font&gt;&lt;/pre&gt;&lt;/div&gt;" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
           <mxGeometry x="160" y="280" width="160" height="60" as="geometry" />
         </mxCell>
-        <mxCell id="_DS3495almi1g_SXSTfi-23" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-5" target="_DS3495almi1g_SXSTfi-19">
+        <mxCell id="_DS3495almi1g_SXSTfi-23" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-5" target="_DS3495almi1g_SXSTfi-19">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
         <mxCell id="_DS3495almi1g_SXSTfi-5" value="&lt;pre style=&quot;font-family:&#39;JetBrains Mono&#39;,monospace;font-size:9.8pt;&quot;&gt;std::vector&amp;lt;arg_data_internal_t&amp;gt;&lt;/pre&gt;" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
@@ -56,13 +56,13 @@
         <mxCell id="_DS3495almi1g_SXSTfi-9" value="&lt;div style=&quot;background-color: rgb(30, 31, 34);&quot;&gt;&lt;pre style=&quot;font-family:&#39;JetBrains Mono&#39;,monospace;font-size:9.8pt;&quot;&gt;&lt;span style=&quot;background-color: rgb(255, 248, 247);&quot;&gt;int32_t&lt;/span&gt;&lt;/pre&gt;&lt;/div&gt;" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
           <mxGeometry x="320" y="440" width="120" height="60" as="geometry" />
         </mxCell>
-        <mxCell id="_DS3495almi1g_SXSTfi-16" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-19" target="_DS3495almi1g_SXSTfi-20">
+        <mxCell id="_DS3495almi1g_SXSTfi-16" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-19" target="_DS3495almi1g_SXSTfi-20">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
-        <mxCell id="_DS3495almi1g_SXSTfi-17" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="_DS3495almi1g_SXSTfi-19" target="_DS3495almi1g_SXSTfi-21">
+        <mxCell id="_DS3495almi1g_SXSTfi-17" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-19" target="_DS3495almi1g_SXSTfi-21">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
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+        <mxCell id="_DS3495almi1g_SXSTfi-18" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge_t="1" parent="1" source="_DS3495almi1g_SXSTfi-19" target="_DS3495almi1g_SXSTfi-22">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
         <mxCell id="_DS3495almi1g_SXSTfi-19" value="&lt;div style=&quot;background-color: rgb(30, 31, 34);&quot;&gt;&lt;pre style=&quot;font-family:&#39;JetBrains Mono&#39;,monospace;font-size:9.8pt;&quot;&gt;&lt;span style=&quot;background-color: rgb(255, 248, 247);&quot;&gt;arg_data_internal_t&lt;/span&gt;&lt;/pre&gt;&lt;/div&gt;" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
diff --git a/include/blt/std/memory.h b/include/blt/std/memory.h
index 164e2da..69a9909 100644
--- a/include/blt/std/memory.h
+++ b/include/blt/std/memory.h
@@ -376,14 +376,14 @@ namespace blt
             constexpr inline T& operator[](size_t index)
             {
                 if (index >= size())
-                    expand(index);
+                    allocate_for(index);
                 return buffer_[index];
             }
             
             constexpr inline const T& operator[](size_t index) const
             {
                 if (index >= size())
-                    expand(index);
+                    allocate_for(index);
                 return buffer_[index];
             }
             
@@ -461,13 +461,10 @@ namespace blt
             {
                 delete_this(buffer_, size());
             }
-        
-        private:
-            void expand(blt::size_t size)
+            
+            void expand(blt::size_t new_size)
             {
-                size = std::max(size_, size);
-                size = blt::mem::next_byte_allocation(size);
-                T* new_buffer = new T[size];
+                T* new_buffer = new T[new_size];
                 if (buffer_ != nullptr)
                 {
                     if constexpr (std::is_trivially_copyable_v<T>)
@@ -486,7 +483,15 @@ namespace blt
                     delete[] buffer_;
                 }
                 buffer_ = new_buffer;
-                size_ = size;
+                size_ = new_size;
+            }
+        
+        private:
+            void allocate_for(blt::size_t accessing_index)
+            {
+                accessing_index = std::max(size_, accessing_index);
+                accessing_index = blt::mem::next_byte_allocation(accessing_index);
+                expand(accessing_index);
             }
             
             inline void delete_this(T* buffer, blt::size_t)