Input that one would normally consider invalid is not accepted anymore.
The following expressions raise an error instead of returning 'x':

'{1 }' format: { 'x' }.
'{1abc}' format: { 'x' }.
'{ 1}' format: { 'x' }.
'{ 1.0 }' format: { 'x' }.
'{1' format: { 'x' }.
'{1 foo' format: { 'x' }.

The following expressions raise an error, instead of writing an error 
message into the return value:

'foo {2} bar {1}' format: { 'x' }. "instead of 'foo [subscript is out of bounds: 2] bar x'"
'foo {0} bar {1}' format: { 'x' }. "instead of 'foo [invalid subscript: 0] bar x'"
'{-0}' format: { 'x' }. "instead of '[invalid subscript: -0]'"

Levente

On Sun, 5 Apr 2015, Marcel Taeumel wrote:

> What means "stricter"? Can you elaborate on what is not possible anymore but
> was?
>
> Best,
> Marcel
>
>
>
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