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Update known problems for default_numeric_fallback (#13794)

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The existing known problem is not actually true, and the many false
positives and false negatives should be mentioned.

Allowing the lint on a single statement:
https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=328de43690af13ed126f7c00c15cd695

changelog: [`default_numeric_fallback`]: update known problems docs
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Catherine Flores 2024-12-08 07:12:15 +00:00 • committed by GitHub
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7
clippy_lints/src/default_numeric_fallback.rs
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@ -26,7 +26,8 @@ declare_clippy_lint! {
/// To ensure that every numeric type is chosen explicitly rather than implicitly.
///
/// ### Known problems
/// This lint can only be allowed at the function level or above.
/// This lint is implemented using a custom algorithm independent of rustc's inference,
/// which results in many false positives and false negatives.
///
/// ### Example
/// ```no_run
@ -36,8 +37,8 @@ declare_clippy_lint! {
///
/// Use instead:
/// ```no_run
/// let i = 10i32;
/// let f = 1.23f64;
/// let i = 10_i32;
/// let f = 1.23_f64;
/// ```
#[clippy::version = "1.52.0"]
pub DEFAULT_NUMERIC_FALLBACK,