Challenge 3: Why the malloc Cast Requirement Shows C++ Is Stricter, Not Just Different — Possible Solution
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The malloc example is evidence of GREATER strictness, specifically,
because C++ REJECTS a program that C ACCEPTS -- and the thing being
rejected is precisely an implicit type conversion (void* silently
becoming int* with no cast) that C is willing to perform automatically
on the programmer's behalf. C++ instead REQUIRES the programmer to
state that conversion explicitly, via a cast, before it will accept
the same code. This is the defining shape of "stricter typing": a
language that demands more explicit, deliberate type-related
declarations from the programmer, and refuses to silently fill in a
conversion on its own, is by definition enforcing a tighter set of
rules than one that performs the conversion implicitly without
complaint. C++ isn't merely doing something DIFFERENT here (like using
different syntax for the same permissiveness) -- it's doing something
LESS permissive, on the exact conversion C allows freely.

Why this is genuinely counter-intuitive: C++ is very commonly
introduced, informally, as "C with more features" -- classes, generics,
smart pointers, and so on -- which naturally suggests a purely
ADDITIVE relationship, where everything C allows should still be
allowed in C++, just with extra capability layered on top. The malloc
example directly contradicts that intuition: it's a case where C++
actually TAKES SOMETHING AWAY relative to C (the implicit void*
conversion), rather than only adding new capability. This matters
because it means "C++ is a superset of C" is not, in fact, literally
true in every respect -- C++ is overwhelmingly compatible with C
source, but not unconditionally so, and type strictness is exactly one
of the specific places that compatibility breaks down.

WHY THIS WORKS AS AN ANSWER
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This defines what "stricter" concretely means in this context (refusing
an implicit conversion the other language permits) rather than using
the word vaguely, and explicitly names the common "C++ is C plus
features" misconception this example contradicts, explaining precisely
why that framing is incomplete.