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Add limitation file

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bovi committed Feb 10, 2016
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# Limitations
The philosophy of mruby is to be a lightweight implementation of
the Ruby ISO standard. These two objectives are partially contradicting
due to the reason that Ruby is a powerful language with complex
implementation details which are difficult to implement in a lightweight
manner.
This document is collecting these limitations.
## Integrity
This document does not contain a complete list of limitations.
Please help to improve it by submitting your findings.
## Confirmed limitations
### ```Array``` passed to ```puts```
Passing an Array to ```puts``` results in different output.
```ruby
puts [1,2,3]
```
#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
```
1
2
3
```
#### mruby [1.2.0 (2015-11-17)]
```
[1, 2, 3]
```
### ```Kernel.raise``` in rescue clause
```Kernel.raise``` without arguments does not raise the current exception within
a rescue clause.
```ruby
begin
1 / 0
rescue
raise
end
```
#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
```ZeroDivisionError``` is raised.
#### mruby [1.2.0 (2015-11-17)]
No exception is raised.

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