Inconsistent support for converting number strings with binary-multiplier / number-type suffixes to numbers

Note:

Changing this would technically be a breaking change and/or may be undesirable for performance reasons, in which case the issue should be documented.

When converting from strings,

PowerShell currently DOES recognize binary-multiplier suffixes such as kb, mb, ...:
- in expressions (e.g., '1gb' / 1)

but DOES NOT recognize them:
- during implicit type conversion in then context of parameter binding (e.g.,
  & { param([int] $foo) } '1gb')
- (perhaps less surprisingly) in explicit type conversions with casts (e.g., [int] '1gb')

Update: The same applies to PowerShell's number-data-type suffixes such as d for [decimal] and l for [long].

Environment data

Written as of:

PowerShell Core 6.1.0-preview.4