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https://issues.apache.org/jira/browse/SLING-9696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Radu Cotescu closed SLING-9696.
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> HTL does not correctly cast the "false" string to Boolean
> ---------------------------------------------------------
>
> Key: SLING-9696
> URL: https://issues.apache.org/jira/browse/SLING-9696
> Project: Sling
> Issue Type: Bug
> Components: Scripting
> Affects Versions: Scripting Sightly Engine 1.0.0, Scripting HTL Engine
> 1.0.20, Scripting HTL Engine 1.1.0-1.4.0, Scripting HTL Engine 1.2.0-1.4.0,
> Scripting HTL Engine 1.3.0-1.4.0, Scripting HTL Engine 1.4.0-1.4.0
> Reporter: Radu Cotescu
> Assignee: Radu Cotescu
> Priority: Major
> Fix For: HTL Maven Plugin 2.0.2-1.4.0, Scripting HTL Runtime
> 1.2.4-1.4.0, Scripting HTL Engine 1.4.4-1.4.0, Scripting HTL Java Compiler
> 1.2.2-1.4.0, Scripting HTL Compiler 1.2.8-1.4.0, Scripting HTL Testing
> 1.0.24-1.4.0
>
>
> The HTL engine implementation from Apache Sling seems to have never correctly
> casted the "false" string to boolean. The HTL specification [0] mentions the
> following:
> {noformat}
> These expressions evaluate to false:
> * false
> * 0 (zero)
> * '' or "" (empty string)
> * [] (empty iterable)
> These evaluate to true:
> * "false" (non-empty string)
> * [0] (non-empty iterable)
> {noformat}
> However, all implementations have returned the Boolean {{false}} for any
> casing of the string "false".
> A change like this has the potential to break the functionality of existing
> HTL code, relying on the fact that the string "false" (irrespective of its
> casing) returns the Boolean {{false}}, however the implementation should obey
> the specification. Therefore I think the fix should be behind a configuration
> flag, which by default allows the engine to continue working with the wrong
> behaviour. Deployers can then decide via configuration if they would like to
> switch the engine to the correct behaviour.
>
> [0] -
> [https://github.com/adobe/htl-spec/blob/1.4/SPECIFICATION.md#115-casting]
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