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vsmalladi committed Jan 25, 2024
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Expand Up @@ -31,7 +31,7 @@ We invite the community to contribute additional test cases to the [WDL Tests](h

WDL is a strongly typed language - every variable, function parameter, and return value has a [type](https://github.com/openwdl/wdl/blob/wdl-1.1/SPEC.md#types), and implementations perform static analysis to ensure that assigned values are of the correct type. However, the WDL type system has some [quirks and inconsistencies](https://github.com/openwdl/wdl/issues/373) that the community has been working to address.

[Hidden Types(https://github.com/openwdl/wdl/blob/wdl-1.1/SPEC.md#hidden-types)] are a new concept added in this release to better explain some existing behavior that many users have found confusing. A hidden type is one that may only be instantiated by the execution engine and cannot be used in a declaration within a WDL file.
[Hidden Types](https://github.com/openwdl/wdl/blob/wdl-1.1/SPEC.md#hidden-types) are a new concept added in this release to better explain some existing behavior that many users have found confusing. A hidden type is one that may only be instantiated by the execution engine and cannot be used in a declaration within a WDL file.

Currently, there is only one hidden type, Union, that represents a value that may have any one of several concrete types. A Union value must always be coerced to a concrete type. There are two places where the Union type is used:

Expand Down Expand Up @@ -60,4 +60,4 @@ The community is also working on WDL 2.0 (also called development). This is the

## Reach out!

The WDL community depends on your involvement to thrive. You are encouraged to ask questions, help other users, and make contributions where you can. Interactions occur primarily on [GitHub](https://github.com/openwdl/wdl) and [Slack](https://join.slack.com/t/openwdl/shared_invite/zt-ctmj4mhf-cFBNxIiZYs6SY9HgM9UAVw). Please see the [README](https://github.com/openwdl/wdl/tree/wdl-1.1#community-and-support) for the full list of community resources.
The WDL community depends on your involvement to thrive. You are encouraged to ask questions, help other users, and make contributions where you can. Interactions occur primarily on [GitHub](https://github.com/openwdl/wdl) and [Slack](https://join.slack.com/t/openwdl/shared_invite/zt-ctmj4mhf-cFBNxIiZYs6SY9HgM9UAVw). Please see the [README](https://github.com/openwdl/wdl/tree/wdl-1.1#community-and-support) for the full list of community resources.

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