lejp: E implies float

    Since eg, 1e-3 is a float without needing a decimal point, let's just
    generally take it that anything with the exponent token is a float, ie, 1e3
    is also a float despite it can be expressed as an integer.

    This seems right also because E is itself not valid in an integer.

    #3308

Author: ribes96

lib/misc/lejp.c

@@ -580,7 +580,8 @@ lejp_parse(struct lejp_ctx *ctx, const unsigned char *json, int len)
 			}
 
 			ctx->buf[ctx->npos] = '\0';
-			if (ctx->f & LEJP_SEEN_POINT) {
+			if (ctx->f & (LEJP_SEEN_POINT | LEJP_SEEN_EXP)) {
+				/* 0.001 or 1E-3 are both floats, take 1E3 as float too */
 				if (ctx->pst[ctx->pst_sp].callback(ctx,
 							LEJPCB_VAL_NUM_FLOAT))
 					goto reject_callback;

minimal-examples/api-tests/api-test-lejp/main.c

@@ -127,6 +127,10 @@ static const char * const json_tests[] = {
 
 	"{" /* SHOULD_FAIL: test 10, missing open */
 		"\"a\":123,\"b\":}"
+	"}",
+
+	"{" /* test 13: float vs int */
+		"\"a\": 1, \"b\": 1.0, \"c\": 1e-3, \"d\": 1e3"
 	"}"
 };