DOC: Mention changes scalar-to-container conversion in migration guide

As suggested by Dženan Zukić.
InsightSoftwareConsortium · Mar 8, 2022 · 9ecef41 · 9ecef41
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diff --git a/Documentation/ITK5MigrationGuide.md b/Documentation/ITK5MigrationGuide.md
@@ -454,6 +454,12 @@ The namespece itself is only available in legacy mode. Some classes were renamed
 
 Enumeration member names (`ITK_COORDINATE_UNKNOWN`, `ITK_COORDINATE_Right`, `ITK_COORDINATE_PrimaryMinor`, `ITK_COORDINATE_ORIENTATION_RIP` etc) are unchanged.
 
+Implicit conversion of a single scalar value to a container (which would _fill_ the container by the
+scalar value) is discouraged. With ITK 5.3, when having `ITK_LEGACY_REMOVE=ON`, the constructors of
+`Point`, `RGBPixel`, `RGBAPixel`, and `Vector` that accept a single scalar value as argument are
+declared `explicit`. ITK 5.3 has included a preferable alternative to these constructors:
+`itk::MakeFilled<ContainerType>(value)`.
+
 Consolidated Vector Filter
 --------------------------