v0.9.11 - explicitely disallow octal indices

Octals are explicitly disallowed in array indices in this release, rather than relying on being in strict mode to do so. All other behavior is the same as v0.9.10, which includes their allowance in script and filter expressions (unless in strict mode). This is because the regex parsing does not check numbers for this (nor do I want to add the code to do so). So if you want to ensure octal indices are not allowed, yet want to allow them in your script and filter expressions: this is your release.