C26429: Use a not_null to indicate that "null" is not a valid value -> Rationale: Prefast attributes are better.
C26446: Prefer to use gsl::at() instead of unchecked subscript operator. -> Rationale: gsl:at() cannot be used. debug STL already checks.
C26459: You called an STL function 'std::transform' with a raw pointer parameter. Consider wrapping your range in a gsl::span and pass as a span iterator (stl.1). -> Rationale: gsl:span() cannot be used. Update to std:span when available.
C26466: Don't use static_cast downcasts. A cast from a polymorphic type should use dynamic_cast. -> Rationale: not using RTTI to support dynamic_cast.
C26472: Don't use static_cast for arithmetic conversions -> Rationale: can only be solved with gsl::narrow_cast
C26474: No implicit cast -> Rationale: many false warnings
C26481: Do not pass an array as a single pointer. -> Rationale: gsl::span is not available.
C26482:Only index into arrays using constant expressions. -> Rationale: static analysis can verify access.
C26485: Do not pass an array as a single pointer -> Rationale: see C26481.
C26486: Lifetime problem. -> Rationale: many false warnings.
C26487: Don't return a pointer that may be invalid (lifetime.4). -> Rationale: many false warnings (VS 2019 16.0.0 Preview 1.1)
C26489: Don't dereference a pointer that may be invalid -> Rationale: many false warnings
C26490: Don't use reinterpret_cast -> Rationale: required to work with win32 API
C26494: Variable 'x' is uninitialized. Always initialize an object -> Rationale: many false warnings, other analyzers are better.
C26812: The enum type '.' is unscoped. Prefer 'enum class' over 'enum' (Enum.3). -> Rationale: complains about enums from the Windows SDK (false warnings).
C26821:Consider using gsl::span instead of std::span to guarantee runtime bounds safety (gsl.view). -> Rationale: Stick to using std::span from C++20.