[v0.24] cherry-picks for v0.24.0 #3200
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A variable with a type but no default value or override resulted in an empty string. This matches the legacy behavior of untyped variables, but does not make sense when using types (an empty string is itself a type violation for everything except `string`). All variables defined with a type but with no value are now a typed `null`. A variable explicitly typed `any` was previously treated as if the typing was omitted; with no defined value or override, that resulted in an empty string. The `any` type is now distinguished from an omitted type; these variables, with no default or override, are also `null`. In other respects, the behavior of `any` is unchanged and largely behaves as if the type was omitted. It's not clear whether it should be supported, let alone how it should behave, so these tests were removed. It's being treated as undefined behavior. Signed-off-by: Roberto Villarreal <[email protected]> (cherry picked from commit 3c0f5c5)
Signed-off-by: CrazyMax <[email protected]> (cherry picked from commit 291c353)
This documents the variable typing introduced in docker#3167. Signed-off-by: Roberto Villarreal <[email protected]> (cherry picked from commit cfeca91)
Signed-off-by: CrazyMax <[email protected]> (cherry picked from commit a11bb49)
tonistiigi
approved these changes
May 21, 2025
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backport of:
nullvalue #3198