fix: std.format accepts boolean for numeric conversion codes

[He-Pin]

Summary

The official Jsonnet spec states:

The string formatting follows the same rules as Python.

In Python, bool is a subclass of int, so "%d" % True returns "1". However, jsonnet currently rejects booleans for all numeric conversion codes with Format required number at N, got boolean.

This fix coerces boolean values to 0/1 at the top of format_code() (after the %s branch, which correctly passes booleans through std.toString), matching Python's behavior.

Before / After

Expression	Python	jsonnet (before)	jsonnet (after)
"%d" % true	"1"	ERROR	"1"
"%d" % false	"0"	ERROR	"0"
"%f" % true	"1.000000"	ERROR	"1.000000"
"%f" % false	"0.000000"	ERROR	"0.000000"
"%x" % true	"1"	ERROR	"1"
"%o" % true	"1"	ERROR	"1"
"%e" % true	"1.000000e+00"	ERROR	"1.000000e+00"
"%g" % true	"1"	ERROR	"1"
"%c" % true	"\x01"	ERROR	"\x01"
"%s" % true	"True"	"true"	"true"

Changes

• stdlib/std.jsonnet: In format_code(), handle %s first with the original value, then coerce booleans to 0/1 via local num_val = if std.type(val) == 'boolean' then (if val then 1 else 0) else val; for all numeric conversion codes (%d, %o, %x, %f, %e, %g, %c).
• test_suite/format.jsonnet: Added assertions for %d, %f, %x, %o, %e, %g, %s with boolean values.

Test plan

• Added assertions for %d, %f, %x, %o, %e, %g with boolean values
• %s with boolean continues to produce "true" / "false" (unchanged)
• Existing tests for numeric and string values remain passing

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