Inline-only in kotlin and kotlin.system packages, split Float/Double extension implementations for JVM and JS to make them inline-only in JVM.

js/js.libraries/src/core/numbers.kt

@@ -0,0 +1,33 @@
+package kotlin
+
+/**
+ * Returns `true` if the specified number is a
+ * Not-a-Number (NaN) value, `false` otherwise.
+ */
+public fun Double.isNaN(): Boolean = this != this
+
+/**
+ * Returns `true` if the specified number is a
+ * Not-a-Number (NaN) value, `false` otherwise.
+ */
+public fun Float.isNaN(): Boolean = this != this
+
+/**
+ * Returns `true` if this value is infinitely large in magnitude.
+ */
+public fun Double.isInfinite(): Boolean = this == Double.POSITIVE_INFINITY || this == Double.NEGATIVE_INFINITY
+
+/**
+ * Returns `true` if this value is infinitely large in magnitude.
+ */
+public fun Float.isInfinite(): Boolean = this == Float.POSITIVE_INFINITY || this == Float.NEGATIVE_INFINITY
+
+/**
+ * Returns `true` if the argument is a finite floating-point value; returns `false` otherwise (for `NaN` and infinity arguments).
+ */
+public fun Double.isFinite(): Boolean = !isInfinite() && !isNaN()
+
+/**
+ * Returns `true` if the argument is a finite floating-point value; returns `false` otherwise (for `NaN` and infinity arguments).
+ */
+public fun Float.isFinite(): Boolean = !isInfinite() && !isNaN()