diff --git a/src/types/methods.nim b/src/types/methods.nim
index bb7f0de..f61e32b 100644
--- a/src/types/methods.nim
+++ b/src/types/methods.nim
@@ -29,10 +29,11 @@ import ../config
 import ../memory
 import ../meta/opcode
 import arraylist
-when DEBUG_TRACE_ALLOCATION:
-    import strformat
+import exception
 
+import strformat
 import parseutils
+import strutils
 
 
 proc typeName*(self: ptr Obj): string =
@@ -433,10 +434,16 @@ proc objAs*(self: ptr Obj, other: ObjectType): returnType =
         of ObjectType.Integer:
             case self.kind:
                 of ObjectType.String:
+                    var str = cast[ptr String](self).toStr()
+                    for c in str:
+                        if not c.isDigit():
+                            result.kind = returnTypes.Exception
+                            result.result = newTypeError(&"invalid literal for int: '{str}'")
+                            return
                     var intVal: int
-                    discard parseInt(cast[ptr String](self).toStr(), intVal)
+                    discard parseInt(str, intVal)
                     result.result = intVal.asInt()
-                of ObjectType.Float:
+                of ObjectType.Float:                               
                     var floatVal: float64
                     discard (parseFloat(cast[ptr Float](self).stringify(), floatVal))
                     result.result = int(floatVal).asInt()
@@ -447,6 +454,22 @@ proc objAs*(self: ptr Obj, other: ObjectType): returnType =
         of ObjectType.Float:
             case self.kind:
                 of ObjectType.String:
+                    var str = cast[ptr String](self).toStr()
+                    var seenDot = false
+                    for c in str:
+                        if not c.isDigit():
+                            if c == '.':
+                                if seenDot:
+                                    result.kind = returnTypes.Exception
+                                    result.result = newTypeError(&"invalid literal for float: '{str}'")
+                                    return
+                                else:
+                                    seenDot = true
+                                    continue
+                            else:
+                                result.kind = returnTypes.Exception
+                                result.result = newTypeError(&"invalid literal for float: '{str}'")
+                                return
                     var floatVal: float64
                     discard parseFloat(cast[ptr String](self).toStr(), floatVal)
                     result.result = floatVal.asFloat()
diff --git a/tests/localization.nim b/tests/localization.nim
index 9e391df..707da20 100644
--- a/tests/localization.nim
+++ b/tests/localization.nim
@@ -18,10 +18,10 @@ const language = 1
 
 when language == 1:
   const aa* = "ICBfX18gICAgX19fICAgX19fICBfX18gIF9fXyAgX19fICAgICAgIF9fICAgICAgX18gIF9fXyAgICBfX18gICBfX18gIF9fXyAgX19fICBfX18gCiAvIF8gXCAgLyBfIFwgfCBfIFwvIF9ffHxfIF98fCBfX3wgICAgICBcIFwgICAgLyAvIC8gXyBcICAvIF8gXCB8IF8gXC8gX198fF8gX3x8IF9ffAp8IChfKSB8fCAoXykgfHwgIF8vXF9fIFwgfCB8IHwgX3wgICAgICAgIFwgXC9cLyAvIHwgKF8pIHx8IChfKSB8fCAgXy9cX18gXCB8IHwgfCBffCAKIFxfX18vICBcX19fLyB8X3wgIHxfX18vfF9fX3x8X19ffCAgICAgICAgXF8vXF8vICAgXF9fXy8gIFxfX18vIHxffCAgfF9fXy98X19ffHxfX198Cgo="
-
   const bb* = "VXd1IFdlIG1hZGUgYSBmKmNreSB3dWNreSEhIEEgd2l0dGxlIGYqY2tvIGJvaW5nbyE="
   const cc* = "VGhlIGNvZGUgbW9ua2V5cyBhdCBvdXIgaGVhZHF1YXJ0ZXJzIGFyZSB3b3JraW5nIFZFV1kgSEFXRCB0byBmaXggdGhpcyEK"
 
+
 proc getCurrentExceptionMessage*: string =
     when language == 1:
         echo decode aa
diff --git a/tests/testmarkup.md b/tests/testmarkup.md
index f5129c3..528471c 100644
--- a/tests/testmarkup.md
+++ b/tests/testmarkup.md
@@ -42,7 +42,7 @@ Modelines also have to be closed by a ']' character
 on the end of this line. These lines may not contain
 whitespace before the opening '[' or "//[" nor after then ending
 ']' characters. Inside the brackets, letters (case
-insensitive), numbers, underscores and dashes form\
+insensitive), numbers, underscores and dashes form
 a name describing what the modeline does.
 
 ```
@@ -138,7 +138,7 @@ There are two kinds of source modes, raw and mixed.
 Mixed source mode can be entered if the detail `mixed`
 is specified. Raw source mode can be entered if the
 detail `raw` is specified. When no detail is specified,
-raw source mode is entered.
+raw source mode is assumed.
 
 In raw source mode, all lines in the mode are
 appended as they are to the JAPL source. In mixed