A cursor over a `BTreeMap` with editing operations, and which allows mutating the key of elements.

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The valueOf() method of String values returns this string value.

A by-value array iterator.

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The endsWith() method of String values determines whether a string ends with the characters of this string, returning true or false as appropriate.

An error returned by `RefCell::try_borrow`.

The Symbol.toPrimitive static data property represents the well-known symbol Symbol.toPrimitive. All type coercion algorithms look up this symbol on objects for the method that accepts a preferred type and returns a primitive representation of the object, before falling back to using the object's valueOf() and toString() methods.

The fontsize() method of String values creates a string that embeds this string in a <font> element (<font size="...">str</font>), which causes this string to be displayed in the specified font size.

The String.raw() static method is a tag function of template literals. This is similar to the r prefix in Python, or the @ prefix in C# for string literals. It's used to get the raw string form of template literals — that is, substitutions (e.g., ${foo}) are processed, but escape sequences (e.g., \n) are not.