prevent bypassing validation using base64
prevent constructing arbitrary function using 'Function'
Merge pull request #145 from phoeagon/master

prevent bypassing validation using base64
Create 15_exceptional_crossing.md

Proposed an injection-style solution
Merge pull request #147 from chenxiaoqino/patch-2

Create 15_exceptional_crossing.md
Prevents retrieval of Function using an instance of it ie. new startLevel.constructor("")()
Merge pull request #151 from stevenws/master

Prevents retrieval of Function using an instance of it ie. new startLevel.constructor("")()
Update 15_exceptional_crossing.md
Update 15_exceptional_crossing.md
Merge pull request #154 from dentuzhik/patch-1

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Update 13_robot_maze.md
Update 15_exceptional_crossing.md

Redefinition approach
Merge pull request #156 from deviator/patch-1

Update 13_robot_maze.md
Merge pull request #157 from CaitSith2/master

Update 15_exceptional_crossing.md
Merge branch 'patch-1' of github.com:029ah/untrusted into 029ah-patch-1
merge
Update 13_robot_maze.md
Update 15_exceptional_crossing.md
infinite-loop prevention no longer introduces new statements - fix #116, fix #150
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