LowFile-scopeKotlin Plug & play

Replace unsafe type casts with explicit checking

Use safe casts (as?) with null checks or require statements instead of unchecked as.

Why this matters

Avoids ClassCastException at runtime and clarifies expected types.

Side-by-side examples engineers can pattern-match during review.

Avoid

val u = obj as User

Prefer

val u = obj as? User ?: return Result.failure(IllegalArgumentException("expected User"))

Bad

(x as List<String>).size

Good

val xs = x as? List<String> ?: emptyList()

From the same buckets as this rule.

Critical
Avoid equality operators in loop termination conditions
Check if loops use equality operators (== or !=) in termination conditions. These can lead to infinite loops if the condition is never met exactly. Instead, use relational operators like < or > for safer loop termination.
error-handlingreadability-refactor
Critical
Avoid Returning Null in Non-Async Task Methods
Returning null from a Task or Task<T> method causes a NullReferenceException if awaited. Use Task.CompletedTask or Task.FromResult<T>(null) instead.
error-handlingreadability-refactor+1
Critical
Avoid Using Boolean Expressions in `except` Statements
Detect `except` clauses that use `or` or `and` to catch multiple exceptions. This does not work as intended. Recommend using a tuple of exceptions instead.
error-handlingstack-python